If Shen drives fewer than 80 miles, the first plan will be cheaper. If he drives more than 80 miles, the second plan will be cheaper.
Let's denote the number of miles driven by "m".
Under the first plan, Shen will pay an initial fee of $40, and then an additional $0.30 for each mile driven. So the total cost, C1, can be expressed as:
C1 = 0.3m + 40
Under the second plan, Shen will not have to pay an initial fee, but he will be charged $0.80 for each mile driven. So the total cost, C2, can be expressed as:
C2 = 0.8m
To determine which plan is cheaper for a given number of miles driven, we can set the two expressions for cost equal to each other and solve for "m":
0.3m + 40 = 0.8m
Subtracting 0.3m from both sides, we get:
40 = 0.5m
Dividing both sides by 0.5, we get:
m = 80
So if Shen drives fewer than 80 miles, the first plan will be cheaper. If he drives more than 80 miles, the second plan will be cheaper.
It's worth noting that this assumes that Shen is only considering the cost of the rental when making his decision. If there are other factors he is considering, such as convenience or availability, he may choose a different plan even if it ends up being slightly more expensive.
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πα d Find dx f-'(4) where f(x) = 4 + 2x3 + sin (*) for –1 5151. = 2
After plugging the derivatives of f(x) we get, dx f-'(4) = f'(√(2/3)) = 4 + cos(Ф)
To find dx f-'(4), we need to take the derivative of f(x) and then solve for x when f'(x) equals 4.
First, let's find the derivative of f(x):
f'(x) = 6x² + cos(Ф)
Next, we need to solve for x when f'(x) equals 4:
6x² + cos(Ф) = 4
cos(Ф) = 4 - 6x²
Now, we can use the given value of πα d to solve for x:
πα d = -1/2
α = -1/2πd
α = -1/2π(-1)
α = 1/2π
d = -1/2πα
d = -1/2π(1/2π)
d = -1/4
So, we have:
cos(Ф) = 4 - 6x²
cos(πα d) = 4 - 6x² (substituting in the given value of πα d)
cos(-π/2) = 4 - 6x² (evaluating cos(πα d))
0 = 4 - 6x²
6x² = 4
x² = 2/3
x = ±√(2/3)
Since we're looking for the derivative at x = 4, we can only use the positive root:
x = √(2/3)
Now, we can plug this value of x back into the derivative of f(x) to find dx f-'(4):
f'(√(2/3)) = 6(√(2/3))² + cos(Ф)
f'(√(2/3)) = 4 + cos(Ф)
dx f-'(4) = f'(√(2/3)) = 4 + cos(Ф)
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a
particle moves along a path in the xy-plane. the path is given by
the parametric equations x(t)=sin(3t) and y(t)=cos(3t), help with
steps A-E
a. Find the velocity b. Find the acceleration. c. Find the speed and simplify your answer completely. d. Find any times at which the particle stops. Thoroughly explain your answer. e. Use calculus to
The given set of questions are solved under the condition of parametric equations x(t)=sin(3t) and y(t)=cos(3t) .
Hence, the length of the curve from t= 0 to t= π is 3π.
Now,
A. To evaluate the velocity, we need to perform the derivative of x(t) and y(t) concerning t.
x'(t) = 3cos(3t)
y'(t) = -3sin(3t)
Therefore, the velocity vector is
v(t) = <3cos(3t), -3sin(3t)>
B. To define the acceleration, we need to evaluate the derivative of v(t) concerning t.
a(t) = v'(t) = <-9sin(3t), -9cos(3t)>
C. To describe the speed, we need to calculate the magnitude of the velocity vector.
|v(t)| = √((3cos(3t))² + (-3sin(3t))²)
= 3
D. In order to find the number of times at which the particle stops, to find when the speed is equal to zero.
|v(t)| = 0 when cos(3t) = 0
sin(3t) = 0.
Therefore,
cos(3t) = 0 when t = (π/6) + (nπ/3),
here n = integer.
sin(3t) = 0 when t = (nπ/3),
here n = integer.
E. To calculate the length of the curve from t=0 to t=π by performing calculus
L = ∫[a,b] √((dx/dt)² + (dy/dt)²) dt
Therefore, a=0 and b=π.
L = ∫[0,π] √((3cos(3t))² + (-3sin(3t))²) dt
= ∫[0,π] 3 dt
= 3π
The given set of questions are solved under the condition of parametric equations x(t)=sin(3t) and y(t)=cos(3t) .
Hence, the length of the curve from t=0 to t=π is 3π.
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The complete question is
A particle moves along a path in the xy-plane. the path is given by
the parametric equations x(t)=sin(3t) and y(t)=cos(3t), help with
steps A-E
a. Find the velocity
b. Find the acceleration.
c. Find the speed and simplify your answer completely.
d. Find any times at which the particle stops. Thoroughly explain your answer.
e. Use calculus to find the length of the curve from t=0 to t = π , show your work.
Your doing practice 3
Based on the information, the three numbers are 14, 34, and 70.
What are the numbers?Based on the information, the second number = 3x - 8
The third number is five times the first number, which can be written as:
third number = 5x
The sum of the three numbers is 118, so we can write an equation:
x + (3x - 8) + 5x = 118
9x - 8 = 118
Adding 8 to both sides:
9x = 126
x = 236 / 914
Now we can use this value of x to find the other two numbers:
second number = 3x - 8 = 3(14) - 8 = 34
third number = 5x = 5(14) = 70
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PLEASE HELP WILL MARK BRANLIEST!!!
The number of bracelets that can be made using all the colors one time only is 720.
Given that Diana is making bracelet with 6 different colors we need to find the number of bracelets that can be made using all the colors one time only,
Since there are 6 beads so, the number of bracelets can be made = 6!
= 720
Hence the number of bracelets that can be made using all the colors one time only is 720.
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Can someone help me fast!?!?
Trying to get better at doing these kinds of problems.
Graph the line -3x + 5y = 15
Which one would it be? This will help a lot :D
According to the question the graph the line -3x + 5y = 15, we can start by solving for y:
-3x + 5y = 15
5y = 3x + 15
y = (3/5)x + 3
Define graph.As an algebraic framework that depicts a specific function by joining a collection of points, a graph is defined. It establishes a pairwise connection among the items. The graph is made up of nodes (vertices) linked by edges. (lines).
Briefing :
Now we have the equation in slope-intercept form (y = mx + b) where the slope is 3/5 and the y-intercept is 3.
To graph the line, we can start at the y-intercept (the point (0, 3)) and then use the slope to find additional points. Since the slope is 3/5, we can move up 3 units to the right 5 units to get to the point (5, 6), and down 3 units to the left 5 units to get to the point (-5, 0). Connect these points to get the line.
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Given the points A: (4,-6,-3) and B: (-2,4,3), find the vector a = AB a = < a >
To find the vector a = AB, we subtract the coordinates of point A from the coordinates of point B:
a = B - A = (-2,4,3) - (4,-6,-3) = (-2-4, 4+6, 3+3) = (-6, 10, 6)
The vector a can be written as a column vector with angle brackets: a = < -6, 10, 6 >.
To find the vector AB (a), we need to subtract the coordinates of point A from the coordinates of point B. Here's the calculation:
a = B - A
a = (-2, 4, 3) - (4, -6, -3)
Now, subtract each corresponding coordinate:
a = (-2 - 4, 4 - (-6), 3 - (-3))
a = (-6, 10, 6)
So, the vector AB (a) is <-6, 10, 6>.
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a student aimed to get a mean mark of 80% in his mathematics test after 9 tests his mean mark is 79%. Calculate the lowest mark he requires in his last test to enable him to achieve his target.
Answer:
89
Step-by-step explanation:
construct the formula to obtain the total of marks in first 9 tests:
79 = x/9
79 * 9 = 711
x = 711
so to get 80% in the next test we construct this formula:
80 = 711 + y / 9 + 1
the value we get for y is 89
to confirm the answer, 711+89/10 gives us 80, which is the correct value we want
Find the exact values of sin 2u, cos2u, and tan2u using the double-angle formulas cot u= square root 2, pi < u < 3pi/2
sin 2u = -1/2, cos 2u = -1/2, tan 2u = 1, because cot u = sqrt(2) and the range of u is between pi and 3pi/2.
How to find the trigonometric function?
Given cot u = sqrt(2) and the range of trigonometric of u, we can determine the values of sine, cosine, and tangent of 2u using the double-angle formulas. First, we can find the value of cot u by using the fact that cot u = 1/tan u, which gives us tan u = 1/sqrt(2). Since u is in the third quadrant (i.e., between pi and 3pi/2), sine is negative and cosine is negative.
Using the double-angle formulas, we can express sin 2u and cos 2u in terms of sin u and cos u as follows:
sin 2u = 2sin u cos u
cos 2u =[tex]cos^2[/tex] u - [tex]sin^2[/tex] u
Substituting the values of sine and cosine of u, we get:
sin 2u = 2*(-sqrt(2)/2)*(-sqrt(2)/2) = -1/2
cos 2u = (-sqrt(2)/2[tex])^2[/tex] - (-1/2[tex])^2[/tex] = -1/2
To find the value of tangent of 2u, we can use the identity:
tan 2u = (2tan u)/(1-[tex]tan^2[/tex] u)
Substituting the value of tan u, we get:
tan 2u = (2*(1/sqrt(2)))/(1 - (1/sqrt(2)[tex])^2[/tex]) = 1
Therefore, sin 2u = -1/2, cos 2u = -1/2, and tan 2u = 1.
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Y=1/3x-3 and y=-x+1 what the answer pls i really need this
The point of intersection between the two given equations is (3, -2).
The problem is asking to find the point of intersection between the two given equations:
y = (1/3)x - 3 ............... (equation 1)
y = -x + 1 ............... (equation 2)
To solve for the intersection point, we can set the two equations equal to each other:
(1/3)x - 3 = -x + 1
Simplifying and solving for x:
(1/3)x + x = 1 + 3
(4/3)x = 4
x = 3
Now that we know x = 3, we can substitute it into either of the two original equations to find y:
Using equation 1: y = (1/3)x - 3 = (1/3)(3) - 3 = -2
Using equation 2: y = -x + 1 = -(3) + 1 = -2
Therefore, the intersection point is (3, -2).
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PLEASE HELP ME WITH THIS MATH PROBLEM!!! WILL GIVE BRAINLIEST!!! 25 POINTS!!!
Answer: In bold
Step-by-step explanation:
The formula they gave is a rate
Let's solve for the rate first.
This equation is done for 3 years 2018-2021 that's why ^3
3.55 = 2.90(1+x)³ >divide both sides by 2.90
1.224 = (1+x)³ > take cube root of both sides
1.0697 = 1+x
x= .0697
so let's make our generic formula
[tex]y = 2.90(1+.0697)^{t}[/tex] let t be years and let y= price
Let's calculate 2018, so this would be year 0
[tex]y = 2.90(1+.0697)^{0}[/tex]
y=$2.90 this is for 2018
They already gave you 2021 price
y=$3.55 this is for 2021
Rate of increase is .0697
In 2025
That's 7 years=t
[tex]y = 2.90(1+.0697)^{7}[/tex]
y=$4.65 for 2025
Suppose the surface area for a can having a particular volume is minimized when the height of the can is equal to 22 cm. If the surface area has been minimized, what would you expect the radius of the can to be? (Round your answer to the nearest tenth if
necessary. You do not need to include the unit.)
If the surface area of a can with a particular volume is minimized when the height of the can is 22 cm, we would expect the radius of the can to be the same as the height, given that a cylinder has the smallest surface area when its height and radius are equal.
The surface area of a can with height h and radius r can be given by the formula:
A = 2πr² + 2πrh
The volume of the can is given by:
V = πr²h
If we differentiate the surface area with respect to r and equate it to zero to find the critical point, we get:
dA/dr = 4πr + 2πh(dr/dr) = 0
Simplifying this expression, we get:
2r + h = 0
Since we know that the height of the can is 22 cm, we can substitute h = 22 in the equation to get:
2r + 22 = 0
Solving for r, we get:
r = -11
Since the radius of the can cannot be negative, we discard this solution. Therefore, the radius of the can should be equal to its height, which is 22 cm.
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Two scout patrols start hiking in opposite directions. Each patrol hikes 5 kilometers. Then the scouts turn 90 degrees to their right and hike another 6 kilometers. How many kilometers are there between the two scout patrols?
The distance between the two scout patrols is approximately 11.66 kilometers.
We can see that the situation forms a right triangle with the hypotenuse representing the distance between the two scout patrols. Let's call this distance d.
Each patrol initially hikes 5 kilometers in opposite directions. This means that the distance between them at this point is 10 kilometers (5 km + 5 km).
Then, each patrol turns 90 degrees to their right and hikes 6 kilometers. This means that they travel along the legs of the right triangle, which have a length of 6 kilometers.
Using the Pythagorean theorem, we can solve for the hypotenuse:
d² = 10² + 6²
d² = 136
d ≈ 11.66 km
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Suppose that the demand for a product is given by 2p²q = 10000 + 9000p² (a) Find the elasticity when p = $50 and q = 4502. (b) What type of elasticity is this? (elastic, unitary or inelastic?)
(c) How would the revenue be affected by an increase in price?
(a) The elasticity at p = $50 and q = 4502 is 2.778.
(b) The elasticity is elastic.
(c) An increase in price would result in a decrease in revenue.
How to determined the elasticity of demand?(a) To find the elasticity when p = $50 and q = 4502, we first need to find the partial derivatives of q with respect to p and then use the elasticity formula:
Demand: 2p²q = 10000 + 9000p²
Partial derivative of q with respect to p: 4pq = 18000p
When p = $50 and q = 4502:
4(50)(4502) = 900800
Elasticity:
e = (p/q) * (dq/dp) = (50/4502) * (900800/18000) = 2.778
(b) To determine what type of elasticity this is, we look at the value of the elasticity calculated in part (a). Since the elasticity is greater than 1, we know that this is an elastic demand.
(c) To determine how the revenue would be affected by an increase in price, we need to look at the relationship between elasticity and revenue. If demand is elastic,
Then an increase in price will result in a decrease in total revenue, and if demand is inelastic, then an increase in price will result in an increase in total revenue.
Since we know that the demand is elastic (from part (b)), we can conclude that an increase in price will lead to a decrease in revenue.
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Scientists estimate that the mass of the sun is 1. 9891 x 10 kg. How many zeros are in this
number when it is written in standard notation?
A 26
B 30
C 35
D 25
There are 26 zeros in this number when it is written in standard notation. The correct answer is option (A). The mass of the sun is estimated to be 1.9891 x 10³⁰kg. To determine the number of zeros in this number when written in standard notation, we need to first convert it to standard form.
In standard form, the number is expressed as a decimal between 1 and 10 multiplied by a power of 10. To convert the given number to standard form, we move the decimal point 30 places to the right because the exponent is positive 30. This gives us 1989100000000000000000000000000. As we can see, there are 27 digits in this number. Therefore, there are 27-1=26 zeros in this number when it is written in standard notation.
In conclusion, the answer is A, 26. This type of question is commonly asked in science and engineering, where large or small numbers are expressed in scientific notation for convenience. Understanding how to convert between scientific notation and standard form is important for anyone studying or working in these fields.
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Find angle C
SinC/4=sin104/8
Answer:
C = 52
Step-by-step explanation:
sin(c/4) = sin(104/8)
sin(c/4) = 0.22495
c/4 = 13
c = 52
the height and age of each child in a random sample of children was recorded. the value of the correlation coefficient between height and age for the children in the sample was 0.8 . based on the least-squares regression line created from the data to predict the height of a child based on age, which of the following is a correct statement? responses on average, the height of a child is 80% of the age of the child. on average, the height of a child is 80% of the age of the child. the least-squares regression line of height versus age will have a slope of 0.8 . the least-squares regression line of height versus age will have a slope of 0.8 . the proportion of the variation in height that is explained by a regression on age is 0.64 . the proportion of the variation in height that is explained by a regression on age is 0.64 . the least-squares regression line will correctly predict height based on age 80% of the time. the least-squares regression line will correctly predict height based on age 80% of the time. the least-squares regression line will correctly predict height based on age 64% of the time.
The least-squares regression line of height versus age will have a slope of 0.8 . Was true statement option (2)
The correlation coefficient (r) measures the strength and direction of a linear relationship between two variables, in this case, height and age. A correlation coefficient of 0.8 indicates a strong positive linear relationship between height and age. The slope of the least-squares regression line represents the change in the height of a child for each one-unit increase in age.
Therefore, a slope of 0.8 indicates that for each one-year increase in age, the expected increase in height is 0.8 units. The other options are not correct or relevant based on the given information.
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Full Question: the height and age of each child in a random sample of children was recorded. the value of the correlation coefficient between height and age for the children in the sample was 0.8 . based on the least-squares regression line created from the data to predict the height of a child based on age, which of the following is a correct statement?
responses on average,
the height of a child is 80% of the age of the child. on average, the height of a child is 80% of the age of the child. the least-squares regression line of height versus age will have a slope of 0.8 . the least-squares regression line of height versus age will have a slope of 0.8 . the proportion of the variation in height that is explained by a regression on age is 0.64 . the proportion of the variation in height that is explained by a regression on age is 0.64 .One measure of student success for colleges and universities is the percent of admitted students who graduate. Studies indicate that a key issue in retaining students is their performance in so-called gateway courses. These are courses that serve as prerequisites for other key courses that are essential for student success. One measure of student performance in these courses is the DFW rate, the percent of students who receive grades of D, F, or W (withdraw). A major project was undertaken to improve the DFW rate in a gateway course at a large midwestern university. The course curriculum was revised to make it more relevant to the majors of the students taking the course, a small group of excellent teachers taught the course, technology (including clickers and online homework) was introduced, and student support outside the classroom was increased. The following table gives data on the DFW rates for the course over three years. In Year 1, the traditional course was given; in Year 2, a few changes were introduced; and in Year 3, the course was substantially revised.
Year DFW Rate Number of Students Taking Course
Year 1 42. 1% 2408
Year 2 24. 3% 2325
Year 3 19. 4% 2126
1. Do you think that the changes in this gateway course had an impact on the DFW rate? (Use α = 0. 1. )
2. State the null and alternative hypotheses.
3. State the Ï2 statistic, degrees of freedom, and the P-value.
Yes. The null hypothesis is that the changes in the course did not have a significant impact on the DFW rate. The chi-squared statistic is 44.63, with 2 degrees of freedom, and the p-value is less than 0.001.
1. Yes, it is likely that the changes in the gateway course had an impact on the DFW rate, as the rate decreased from 42.1% in Year 1 to 19.4% in Year 3.
2. The null hypothesis is that the changes in the course did not have a significant impact on the DFW rate, while the alternative hypothesis is that the changes did have a significant impact on the rate.
3. The chi-squared statistic is 44.63, with 2 degrees of freedom, and the p-value is less than 0.001. This indicates that there is a significant relationship between the year the course was given and the DFW rate, providing evidence to reject the null hypothesis in favor of the alternative hypothesis that the changes made to the course had a significant impact on the DFW rate.
The p-value of less than 0.001 indicates strong evidence against the null hypothesis, as it is less than the significance level of 0.1.
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A regular hexagon is shown. What is the measure of the radius, c, rounded to the nearest inch? use the appropriate trigonometric ratio to solve. 6 in. 10 in. 14 in. 24 in.
The measure of the radius of the hexagon rounded to the nearest inch is 14 inches.
The problem presents a hexagon with a central angle of 60º, and the task is to calculate its radius. To do so, we can use the trigonometric relationship between the radius, apothem, and an angle. The apothem is a line segment from the center of a polygon perpendicular to one of its sides. For a regular hexagon, the apothem length is equal to the radius, which we want to find.
The trigonometric relationship for this case is cos(30) = a/c, where a is the apothem and c is the radius. By rearranging the equation to solve for c, we get c = a/cos(30).
Substituting the value of 12 inches for the apothem, we get c = 12/cos(30). Using a calculator, we can find that cos(30) = 0.866, so c = 12/0.866 = 13.855 inches.
To round to the nearest whole number, we get c = 14 inches.
Correct Question :
A regular hexagon is shown. What is the measure of the radius, c, rounded to the nearest inch? use the appropriate trigonometric ratio to solve. 6 in. 10 in. 14 in. 24 in.
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600 is writtena s 2^a x b x c^d
where a , b, c and d are all prime numbers
Find the value of a,b,c and d
Answer:
a = 3
b = 1
c = 5
d = 2
Step-by-step explanation:
To find the prime factorization of 600, we can use trial division by dividing by the smallest prime numbers until we reach a prime factor:
600 ÷ 2 = 300
300 ÷ 2 = 150
150 ÷ 2 = 75
75 ÷ 3 = 25
25 ÷ 5 = 5
Therefore, the prime factorization of 600 is:
600 = 2^3 × 3^1 × 5^2
So, a = 3, b = 1, c = 5, and d = 2.
help I want to get this done
Answer:
j: 0, m: (-4)
Step-by-step explanation:
RECALL:
Rational function is the func. expressed by polynomials p(x) and q(x) as:
p(x)/q(x) where q(x) is non-zero
j(m+4) must be non zero, or
j(m+4)≠0
j≠0 and m+4≠0
j≠0 and m≠(-4)
Write the algebraic expression that matches each graph.
Graph inserted below via image.
Answer: 7
Step-by-step explanation:
Answer:
y=|x-2|-2
Step-by-step explanation:
Go onto desmos and you can ask it to graph an equation to test your answers.
1) Figure HIDE has vertices at coordinates H(1,4), I(2, -1), D(4, -3), and E(5, 3). What are the coordinates for H’I’D’E’ if H’I’D’E’=R (HIDE)? You can edit the drawing below to plot the points if you prefer.
The coordinates for H’I’D’E’ after a reflection over the y-axis include the following:
H' (-1, 4).
I' (-2, -1).
D' (-4, -3).
D' (-5, 3).
What is a reflection over the y-axis?In Mathematics and Geometry, a reflection over or across the y-axis or line x = 0 is represented and modeled by this transformation rule (x, y) → (-x, y).
By applying a reflection over the y-axis to the coordinate of the given quadrilateral HIDE, we have the following coordinates:
(x, y) → (-x, y).
Coordinate H = (1, 4) → Coordinate H' = (-(1), 4) = (-1, 4).
Coordinate I = (2, -1) → Coordinate I' = (-(2), -1) = (-2, -1).
Coordinate D = (4, -3) → Coordinate D' = (-(4), -3) = (-4, -3).
Coordinate E = (5, 3) → Coordinate D' = (-(5), 3) = (-5, 3).
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Give an example of a Benchmark fraction and an example of a mixed number
The benchmark fractions are the most common fraction.
Such as 1/2, 0, 3/8 etc.
What is a mixed fraction?Mixed fractions are a type of fraction in which there is a whole number part and a fractional part. for example 17/3 would be 5 2/3 as a mixed fraction
Please help me :/
You can make a 6-digit security number using the digits 1-9 and digits cannot be repeated. Show all work and formulas used in computing your answers.
a) How many numbers can you make if there are no additional restrictions?
b) How many numbers can you make if the first digit cannot be a one?
c) How many odd numbers can you make (the last digit is odd?)
d) How many numbers greater than 300,000 can you make?
e) How many numbers greater than 750,000 can you make?
Sure, I'd be happy to help you with these questions!
a) To calculate the total number of possible 6-digit security numbers, we can use the permutation formula:
nPr = n! / (n-r)!
where n is the total number of digits available (9) and r is the number of digits we are selecting (6).
So, the number of possible 6-digit security numbers without any restrictions is:
9P6 = 9! / (9-6)! = 9! / 3! = 9 x 8 x 7 x 6 x 5 x 4 = 60,480
Therefore, there are 60,480 possible 6-digit security numbers that can be made with the digits 1-9 without repeating any digits.
b) If the first digit cannot be a one, we are left with 8 choices for the first digit (since we cannot use 1) and 8 choices for the second digit (since we have already used one digit). For the remaining 4 digits, we still have 7 choices for each digit, since we cannot repeat any digits.
Using the permutation formula again, the number of possible 6-digit security numbers with the first digit not being one is:
8 x 8 x 7 x 7 x 7 x 7 = 1,322,496
Therefore, there are 1,322,496 possible 6-digit security numbers that can be made with the digits 1-9 without repeating any digits, where the first digit is not one.
c) To create an odd number, the last digit must be an odd number, which means we have 5 choices for the last digit (1, 3, 5, 7, or 9). For the first digit, we cannot use 0 or 1, so we have 7 choices. For the remaining 4 digits, we still have 8 choices for each digit (since we can use any digit).
Using the permutation formula again, the number of possible 6-digit security numbers with the last digit being odd is:
7 x 8 x 8 x 8 x 8 x 5 = 7,1680
Therefore, there are 7,1680 possible 6-digit security numbers that can be made with the digits 1-9 without repeating any digits, where the last digit is odd.
d) To create a number greater than 300,000, the first digit must be 3, 4, 5, 6, 7, 8, or 9. If the first digit is 3, we have 7 choices for the first digit (3, 4, 5, 6, 7, 8, or 9). For the remaining 5 digits, we still have 8 choices for each digit.
If the first digit is not 3, we have 6 choices for the first digit (since we cannot use 1 or 2). For the remaining 5 digits, we still have 8 choices for each digit.
Using the permutation formula again, the number of possible 6-digit security numbers greater than 300,000 is:
7 x 8 x 8 x 8 x 8 x 8 + 6 x 8 x 8 x 8 x 8 x 8 = 2,526,720
Therefore, there are 2,526,720 possible 6-digit security numbers that can be made with the digits 1-9 without repeating any digits, where the number is greater than 300,000.
e) To create a number greater than 750,000, the first digit must be 8 or 9. If the first digit is 8, we have 2 choices for the first digit (8 or 9). For the remaining 5 digits, we still have 8 choices for each digit.
If the first digit is 9, we only have one choice for the first digit (9). For the remaining 5 digits, we still have 8 choices for each digit.
Using the permutation formula again, the number of possible 6-digit security numbers greater than 750,000 is:
2 x 8 x 8 x 8 x 8 x 8 + 1 x 8 x 8 x 8 x 8 x 8 = 262,144
Therefore, there are 262,144 possible 6-digit security numbers that can be made with the digits 1-9 without repeating any digits, where the number is greater than 750,000.
please show all steps :)
For the following system: Determine how, if at all, the planes intersect. If they do, determine the intersection. [2T/3A] 2x + 2y + z - 10 = 0 5x + 4y - 4z = 13 3x – 2z + 5y - 6 = 0
The planes intersect at the point (-19/21, -11/14, 1).
How to find intersection of three planes in three-dimensional space?To determine how, if at all, the planes intersect, we need to solve the system of equations given by the three planes:
[2T/3A] 2x + 2y + z - 10 = 0
5x + 4y - 4z = 13
3x – 2z + 5y - 6 = 0
We can use elimination to solve this system. First, we can eliminate z from the second and third equations by multiplying the second equation by 2 and adding it to the third equation:
5x + 4y - 4z = 13
6x - 4z + 10y - 12 = 0
11x + 14y - 12 = 0
Next, we can eliminate z from the first and second equations by multiplying the first equation by 2 and subtracting the second equation from it:
4x + 4y + 2z - 20 = 0
-5x - 4y + 4z = -13
9x - y - 6z - 20 = 0
Now we have two equations in three variables. To eliminate y, we can multiply the second equation by 14 and subtract it from the first equation:
11x + 14y - 12 = 0
-70x - 56y + 56z = -182
-59x - 42z - 12 = 0
Finally, we can substitute this expression for x into one of the previous equations to find z:
3(59/42)z - 12/42 - 2y - 10 = 0
177z - 60 - 84y - 420 = 0
177z - 84y - 480 = 0
Now we have two equations in two variables, z and y. We can solve for y in terms of z from the second equation:
y = (177/84)z - (480/84)
Substituting this expression for y into the third equation, we can solve for z:
177z - 84[(177/84)z - (480/84)] - 480 = 0
177z - 177z + 480 - 480 = 0
This equation simplifies to 0=0, which means that z can be any value. Substituting z=1 into the expression for y, we get:
y = (177/84)(1) - (480/84) = -11/14
Substituting z=1 and y=-11/14 into the expression for x, we get:
x = (59/42)(1) - (12/42) + 2(-11/14) + 10 = -19/21
Therefore, the planes intersect at the point (-19/21, -11/14, 1).
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Given the exponential decay function f (t) = 2(0. 95) find the average
rate of change from x =0 to x =4. Show your work.
The average rate of change is -0.1295, under the condition the given exponential decay function is f (t) = 2(0. 95).
In order to find the average rate of change from x=0 to x=4 for the given exponential decay function [tex]f(t) = 2(0.95)^{t}[/tex], we need to find the slope of the line that passes through the points (0,f(0)) and (4,f(4)).
f(0) = 2(0.95)⁰ = 2
f(4) = 2(0.95)⁴ ≈ 1.482
The slope of the line passing through these two points is:
(f(4) - f(0))/(4 - 0)
= (1.482 - 2)/4
≈ -0.1295
Therefore, the average rate of change from x=0 to x=4 is approximately -0.1295.
An exponential decay function is a form of a function that reduces at a constant rate over time. It is a type of mathematical model used to present many real-world phenomena such as radioactive decay, population growth, and the depreciation of assets.
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In 2016, Dave bought a new car for $15,500. The current value of the car is $8,400. At what annual rate did the car depreciate in value? Express your answer as a percent (round to two digits between decimal and percent sign such as **. **%). Use the formula A(t)=P(1±r)t
The car depreciated at an annual rate of approximately 45.81%.
In 2016, Dave bought a new car for $15,500, and its current value is $8,400. To find the annual depreciation rate, we'll use the formula A(t) = P(1 ± r)t, where A(t) is the future value, P is the initial value, r is the annual rate, and t is the time in years.
Here, A(t) = $8,400, P = $15,500, and t = 1 (one year). We are solving for r, the annual depreciation rate.
$8,400 = $15,500(1 - r)¹
To isolate r, we'll first divide both sides by $15,500:
$8,400/$15,500 = (1 - r)
0.541935 = 1 - r
Now, subtract 1 from both sides:
-0.458065 = -r
Finally, multiply both sides by -1 to find r:
0.458065 = r
To express r as a percentage, multiply by 100:
0.458065 x 100 = 45.81%
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The car depreciated at an annual rate of 12.2%.
How to find depreciated value of car?The car depreciated in value over time, so we want to find the rate of decrease. We can use the formula:
A(t) = P(1 - r)t
where A(t) is the current value of the car, P is the original price of the car, r is the annual rate of depreciation, and t is the time elapsed in years.
We can plug in the given values and solve for r:
$8,400 = $15,500(1 - r)⁵
Dividing both sides by $15,500, we get:
0.54 = (1 - r)⁵
Taking the fifth root of both sides, we get:
(1 - r) = 0.878
Subtracting 1 from both sides, we get:
-r = -0.122
Dividing both sides by -1, we get:
r = 0.122
Multiplying by 100 to express as a percentage, we get:
r = 12.2%
Therefore, the car depreciated at an annual rate of 12.2%.
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Will mark brainliest (to whoever explains this clearly)
Lizzie came up with a divisibility test for a certain number m that doesn't equal 1:
-Break a positive integer n into two-digit chunks, starting from the ones place. (For example, the number 354764 would break into the two-digit chunks 64, 47, 35. )
- Find the alternating sum of these two-digit numbers, by adding the first number, subtracting the second, adding the third, and so on. (In our example, this alternating sum would be 64-47+35=52. )
- Find m, and show that this is indeed a divisibility test for m (by showing that n is divisible by m if and only if the result of this process is divisible by m)
Lizzie's divisibility test states that a number n is divisible by a certain number m if and only if the alternating sum of its two-digit chunks is divisible by m.
How does Lizzie's divisibility test work?Lizzie's divisibility test involves breaking a positive integer into two-digit chunks, finding the alternating sum of these chunks, and then determining if the result is divisible by a certain number m.
To apply the test:
Break the positive integer n into two-digit chunks from right to left.Calculate the alternating sum of these two-digit numbers, adding the first number, subtracting the second, adding the third, and so on.Find m, the divisor for which you want to test divisibility.If the result of the alternating sum is divisible by m, then n is also divisible by m.To prove that this is a divisibility test for m, you need to show that n is divisible by m if and only if the result of the alternating sum is divisible by m.
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use the given information to solve the triangle
C=135° C = 45₁ B = 10°
4)
5) A = 26°₁ a = 10₁ 6=4
6) A = 60°, a = 9₁ c = 10
7) A=150° C = 20° a = 200
8) A = 24.3°, C = 54.6°₁ C = 2.68
9) A = 83° 20′, C = 54.6°₁ c 18,1
The law of sines is solved and the triangle is given by the following relation
Given data ,
From the law of sines , we get
a / sin A = b / sin B = c / sin C
a)
C = 135° C = 45₁ B = 10°
So , the measure of triangle is
A/ ( 180 - 35 - 10 ) = A / 35
And , a/ ( sin 135/35 ) = sin 35 / a
On simplifying , we get
a = 36.50
Hence , the law of sines is solved
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What is the FICA tax on an income of $47,000? Remember that FICA is
taxed at 7.65%
The FICA tax will be $3595.5 on an income of $47,000.
Given that the principal amount = $47,000
Given that the FICA is taxed at the percentage of 7.65%
To findout the FICA tax we have to findout the 7.65% of money from the principal money $47,000.
The formula for finding the Y% of money from Z amount is = [tex]\frac{y}{100}[/tex] * Z
From the above formula, we can find the FICA tax.
FICA tax = [tex]\frac{7.65}{100}[/tex] * 47000 = 0.0765 * 47000 = 3595.5.
From the above solution, we can conclude that the FICA tax on an income of $47,000 is $3595.5
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