The answer is reasonable because it is positive and also the equation is true . it would take Lara about 5.3 hours to clean the tank by herself.
Let's denote the time it takes for Lara to clean the tank alone as "L". We can use the formula for the combined work rate of two people, which is:
(1/7) + (1/L) = (1/3)
Multiplying both sides by the least common denominator, 21L, gives:
3L + 21 = 7L
Subtracting 3L from both sides, we get:
21 = 4L
Dividing both sides by 4, we get:
L = 5.25 hours (to the nearest tenth)
The answer is reasonable because it is positive, and it is also less than 7 hours, which is Kevin's time. When substituted back into the original equation, we get:
(1/7) + (1/5.25) = (1/3)
0.1429 + 0.1905 = 0.3333
0.3334 ≈ 0.3333
The equation is true, so the answer is reasonable. Therefore, it would take Lara about 5.3 hours to clean.
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Find the magnitude and direction of the vector u = <-4, 7>
The magnitude and direction of the vector u = <-4, 7> are |u| ≈ √65 and θ ≈ 119.74°.
To find the magnitude and direction of the vector u = <-4, 7>, we will use the following steps:
1. Calculate the magnitude using the Pythagorean theorem.
2. Calculate the direction using the arctangent function.
Step 1: Calculate the magnitude.
Magnitude (|u|) = √((-4)^2 + (7)^2) = √(16 + 49) = √65
Step 2: Calculate the direction (angle θ).
θ = arctan(opposite/adjacent) = arctan(7/-4) ≈ -60.26° (in degrees)
Since the vector is in the second quadrant, we need to add 180°.
θ = -60.26° + 180° ≈ 119.74°
So, the magnitude and direction of the vector u = <-4, 7> are |u| ≈ √65 and θ ≈ 119.74°.
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A 3-inch candle burns down in 3 hours. At what rate does the candle burn, in inches per hour?
Answer 1 inch per hour
Step-by-step explanation:
Answer:
1 inch per hour
Step-by-step explanation:
Let x represent inches burned per hour
The equation to finding the rate of the candle burning:
3x=3
For those who dont know, whenever you have a variable with a term, its basically multiplying, and we want to do the opposite to get x by itself, so we divide
x=3/3
Which can be simplified as:
x=1
Where x is the inches burned per hour, which equal 1
A rectangle city park measures 7/10 mile by 2/6 mile. what is the area of the park?
The area of the rectangular park is equal to 0.233 sq miles.
The measurements of the park that are given in the question are given as 7/10 mile by 2/6 mile.
The length of the rectangle park is 7/10 and the width of the park is 2/6 mile. We know that the area of the rectangle park is given as the:
= length * width of the park.
= L * W
= (7/10) * (2/6)
we can reduce the fraction even further to make the calculation easy
= (7/10) * (1/3)
Multiplying the denominators we get
= 7/30
To make the answer even simpler it can be converted into a decimal form which will be:
= 0.233 sq miles.
Therefore, The area of the rectangular park is equal to 0.233 sq miles.
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A national grocery chain is considering expanding their selection of prepared meals available for purchase. They believe that nationwide, 67 percent of households purchase at least one prepared meal per week from the grocery store. The results of a survey given to a random sample of Maryland households found that 641 out of 1,035 households purchase at least one meal per week at the store
61.93% of the surveyed Maryland households purchase at least one prepared meal per week from the grocery store.
A national grocery chain is considering expanding their selection of prepared meals, and they believe that 67 percent of households purchase at least one meal per week from the grocery store. In a survey conducted in Maryland, 641 out of 1,035 households purchase at least one meal per week at the store.
To determine the percentage of Maryland households purchasing at least one prepared meal per week, follow these steps:
Divide the number of households purchasing at least one meal per week (641) by the total number of households surveyed (1,035).
Multiply the result by 100 to get the percentage.
Here's the calculation: (641 / 1,035) x 100 = 61.93%
So, 61.93% of the surveyed Maryland households purchase at least one prepared meal per week from the grocery store.
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Annmarie can plow a field in 240 minutes. Gladys can plow a field 80 minutes faster. If they work together, how many minutes does it take them to plow the field?
It would take Annmarie and Gladys 96 minutes to plow the field together.
How long to plow field together?
Annmarie can plow a field in 240 minutes. Gladys can plow the same field 80 minutes faster than Annmarie.
So Gladys can plow the field in 240 - 80 = 160 minutes.
Let x be the time it takes for both of them to plow the field together.
The combined rate of Annmarie and Gladys is the sum of their individual rates.
Annmarie's rate is 1 field per 240 minutes, which is 1/240 field per minute.
Gladys's rate is 1 field per 160 minutes, which is 1/160 field per minute.
Their combined rate is:
1/240 + 1/160 = 1/x
Simplifying this equation:
1/x = (4/960) + (6/960) = 10/960
1/x = 1/96
Multiplying both sides by 96, we get:
x = 96 minutes
Therefore, it would take Annmarie and Gladys 96 minutes to plow the field together.
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What is the horizontal distance between (16, -24) to (-3, -24)
-13 units
-19 units
13 units
19 units
The horizontal distance between (16, -24) and (-3, -24) is 19 units.
Explanation:
We can calculate the horizontal distance by finding the difference between the x-coordinates of the two points.
Horizontal distance = difference in x-coordinates = (-3) - 16 = -19
However, the distance is negative, which doesn't make sense as distance is always positive. So we take the absolute value of the difference to get the actual distance.
|Horizontal distance| = |-19| = 19
Therefore, the horizontal distance between the two points is 19 units.
A Texas House representative proposed placing solar panels on all public schools to increase green energy and reduce energy costs for districts. Suppose a manufacturer’s panels will be purchased only if real world results of the proposed panels show that more than 18% of the panels produce an efficiency rating greater than 20%. Of a random selection of 140 panels, 32 of the panels result in an efficiency rating greater than 20%. Is there sufficient evidence at the 5% significance level to purchase the proposed panels?
By null hypothesis there is sufficient evidence at the 5% significance level to purchase the proposed panels.
To determine if there is sufficient evidence to purchase the proposed panels, we can perform a hypothesis test. Let's define the following:
- p: the proportion of all panels that produce an efficiency rating greater than 20%
- p0: the proportion specified in the proposal, which is p0 = 0.18
- n: the sample size, which is n = 140
- x: the number of panels in the sample that produce an efficiency rating greater than 20%, which is x = 32
We want to test the null hypothesis H0: p <= p0 against the alternative hypothesis Ha: p > p0. The significance level is alpha = 0.05.
We can use the normal approximation to the binomial distribution since both np0 and n(1-p0) are greater than 10, where np0 is the expected number of panels that produce an efficiency rating greater than 20% under the null hypothesis.
Under the null hypothesis, the test statistic z is approximately:
z = (x - np0) / sqrt(np0(1-p0))
Plugging in the values, we get:
z = (32 - 140*0.18) / sqrt(140*0.18*0.82) ≈ 1.96
The critical value of z at alpha = 0.05 with a one-tailed test is 1.645. Since our calculated z value is greater than the critical value, we reject the null hypothesis.
Therefore, there is sufficient evidence at the 5% significance level to purchase the proposed panels.
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Use any method to determine whether the series converges а. น k2 sk (5 pts) b 6. Ex 2+(-1){ 5k (5 pts)"
To determine whether the series น k2 sk converges, we can use the Integral Test. Let f(x) = x2, then f'(x) = 2x. Since 2x is continuous, positive, and decreasing on [1,∞), In summary, the series Σ (1/k^2) converges, while the series Σ (2 + (-1)^{5k}) does not converge.
∫1∞ f(x) dx = ∫1∞ x2 dx = lim (t → ∞) [1/3 x3]1t = ∞
Since the integral diverges, the series น k2 sk also diverges.
b. To determine whether the series 2+(-1){ 5k converges, we can use the Alternating Series Test. The series has alternating signs and the absolute value of each term decreases as k increases. Let ak = 2+(-1){ 5k, then:
|ak| = 2+1/32k ≤ 2
Also, lim (k → ∞) ak = 0. Therefore, by the Alternating Series Test, the series 2+(-1){ 5k converges.
a. For the series Σ (1/k^2) (denoted as น k2 sk), we can use the p-series test. A p-series is a series of the form Σ (1/k^p), where p is a constant. If p > 1, the series converges, and if p ≤ 1, the series diverges. In this case, p = 2, which is greater than 1. Therefore, the series Σ (1/k^2) converges.
b. For the series Σ (2 + (-1)^{5k}), we can use the alternating series test. An alternating series is a series that alternates between positive and negative terms. In this case, the series alternates because of the (-1)^{5k} term. However, the series does not converge to zero as k goes to infinity, since there is a constant term 2. Therefore, the series Σ (2 + (-1)^{5k}) does not converge.
In summary, the series Σ (1/k^2) converges, while the series Σ (2 + (-1)^{5k}) does not converge.
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23. A triangular earring has side lengths of 1. 5 centimeters, 2 centimeters, and 3
centimeters. What is the approximate measure, in degrees, of the largest angle of the
triangular earring?
А
36. 3°
B.
45. 8°
C. 117. 3°
D.
134. 2°
Using cosine rule, the largest angle In the triangle is
C. 117. 3°How to find the measure of the largest angleThe angle is found first using cosine rule by the formula
cos A = (b² + c² - a²) ÷ 2bc
Solving for the largest angle
substituting the values
cos γ = (2² + 1.5² - 3²) ÷ 2 * 1.5 * 2
< γ = arc cos ( -0.4583 )
< γ = 117.28 degrees
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C = 172. 7 cm
Use the formula, c = πd, and π = 3. 14, to find the diameter of this circle whose circumference equals 172. 7 cm.
O A. 55 cm
O B. 27. 5 cm
O C. 542. 278 cm
O D. 5. 5 cm
O E. 86. 35 cm
The diameter of the circle whose circumference equals 172.7 cm is approximately 55 cm, as found using the formula c = πd with the given value of π as 3.14. The answer is option A.
The formula for the circumference of a circle is c = πd, where c is the circumference and d is the diameter. We are given that the circumference of the circle is 172.7 cm, and π is approximately 3.14. So we can solve for the diameter as
d = c/π = 172.7/3.14 ≈ 55
Therefore, the diameter of the circle is approximately 55 cm.
The correct answer is option A: 55 cm.
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A man sets out to travel from A to C via B. From A he travels a distance of 8km on a bearing N30degreesE to B. From B he travels further 6km due east. Calculate how far is north of A, east of A
The displacement of the man from Noth east of A from C is 12.2 km.
What is the displacement of the man?
The displacement of the man is the distance between his initial position at A and final position at C.
The angle formed at position B is calculated as follows;
θ = 30⁰ + 90⁰
θ = 120⁰
The displacement of the man is calculated by applying cosine rule as follows;
d² = 8² + 6² - 2(8 x 6) cos (120)
d² = 148
d = √148
d = 12.2 km
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Oscar simultaneously tosses a fair coin and rolls an eight-sided fair die.
The probability that Oscar gets heads and an even number is
. The probability that Oscar gets tails and a prime number less than 4 is
.
Answer: The probability of getting heads on a fair coin is 1/2, and the probability of rolling an even number on an eight-sided fair die is 4/8 = 1/2. Therefore, the probability of getting both heads and an even number is:
P(heads and even number) = P(heads) x P(even number) = (1/2) x (1/2) = 1/4
The probability of getting tails on a fair coin is also 1/2, and the prime numbers less than 4 are 2 and 3. The probability of rolling a 2 or a 3 on an eight-sided fair die is 2/8 = 1/4. Therefore, the probability of getting tails and a prime number less than 4 is:
P(tails and prime number less than 4) = P(tails) x P(prime number less than 4) = (1/2) x (1/4) = 1/8
So the probability that Oscar gets heads and an even number is 1/4, and the probability that Oscar gets tails and a prime number less than 4 is 1/8.
Step-by-step explanation: can i get brianliest :D
The antiderivative ofeᵏˣ, where k is any constant, is... ½ eᵏˣ + c keᵏˣ + c eᵏˣ + c In(kx)+C
The antiderivative of e^(kx), where k is any constant, is (1/k)e^(kx) + C, where C is the constant of integration.
1. As we can see, you are asked to find the antiderivative of the function e^(kx).
2. Recall that the antiderivative of a function is the function that, when differentiated, gives you the original function.
3. The derivative of the function (1/k)e^(kx) is e^(kx), as the constant k in the exponent gets multiplied by the (1/k) factor, canceling each other out.
4. So, the antiderivative of e^(kx) is (1/k)e^(kx) + C, where C is the constant of integration.
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You are throwing a birthday party and are ordering pizza for your guests! You are guessing there will be about 30 people in attendance. You have two options for pizzas! You have budgeted $215 for food so you want to go with the option that will give you the better deal. This means the option that gives you a cheaper price per square inch of pizza
Based on these calculations, option 1 gives you the cheaper price per square inch of pizza.
To determine which option will give you a cheaper price per square inch of pizza, you will need to compare the prices of the two options and calculate their respective prices per square inch.
Let's say option 1 is a large pizza with a diameter of 18 inches and costs $20, while option 2 is a medium pizza with a diameter of 14 inches and costs $15.
To calculate the area of each pizza, you need to use the formula for the area of a circle:
A = πr^2
For option 1, the radius is 9 inches (half of the diameter), so the area is:
A = π(9)^2 = 81π square inches
For option 2, the radius is 7 inches (half of the diameter), so the area is:
A = π(7)^2 = 49π square inches
Now you can calculate the price per square inch for each option by dividing the cost by the area:
Option 1:
Price per square inch = $20 / (81π) = $0.078/square inch
Option 2:
Price per square inch = $15 / (49π) = $0.098/square inch
Based on these calculations, option 1 gives you the cheaper price per square inch of pizza.
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The table shows the number of devices owned by a local company. What percent of these devices are tablets?
Laptop- 44
Tablet- 94
Desktop- 62
Laptop- 44, Tablet- 94, Desktop- 62, Percentage of tablets- 47%.
What percentage of the devices owned by the local company are tablets?To calculate the percentage of devices that are tablets, we need to find the proportion of tablets among all devices. In this case, there are 94 tablets out of a total of 200 devices (44 laptops + 94 tablets + 62 desktops).
To find the proportion, we divide the number of tablets by the total number of devices: 94/200 = 0.47.
To convert this proportion to a percentage, we multiply by 100: 0.47 * 100 = 47%.
47% of the devices owned by the local company are tablets.
This means that nearly half of the devices fall into the tablet category, making it a significant portion of their device inventory.
It's important to note that this calculation assumes the given numbers accurately represent the actual device distribution and that there are no missing or unaccounted devices.
By determining the percentage of tablets, we gain insight into the composition of the device inventory, which can be useful for decision-making and resource allocation within the local company.
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Let (6,t) = F(u(, t), (s, t)) where (1.0) - 6,0,(1,0) = -5,4 (1,0) = -7 (1,0) - 7,0,(1,0) - 9,(1,0) 5 F.(6, 7) = 4, F.(6, -7)=7 W,(1,0)= ______
It seems that the question provided is not clear and has some typos or formatting issues, making it difficult to understand the exact problem you need help with. Please rephrase or clarify the question, and I'll be more than happy to help you!
To find W,(1,0), we need to use the formula for the partial derivative of F with respect to u at (6,7) and (6,-7) and plug in the given values:
F_u(6,7) = 6,0(6,7) = -5
F_u(6,-7) = 6,0(6,-7) = -7
Now we can use these values to solve for W,(1,0) using the formula:
W,(1,0) = F(6,t) - F_u(6,7)(1-6) - F_u(6,-7)(1-6)
Plugging in the given values, we get:
W,(1,0) = F(6,t) - (-5)(-5) - (-7)(-5)
W,(1,0) = F(6,t) + 30
We still need to find F(6,t). To do this, we use the formula for the partial derivative of F with respect to s at (1,0) and plug in the given values:
F_s(1,0) = 1,0(6,0) - 7,0(1,0) - 9,0(1,0)
F_s(1,0) = -7
Now we can use F_u(6,7), F_u(6,-7), and F_s(1,0) to solve for F(6,t) using the formula:
F(6,t) = F_u(6,7)(6,t-7) + F_u(6,-7)(6,t+7) + F_s(1,0)(t)
Plugging in the given values, we get:
F(6,t) = (-5)(6,t-7) + (-7)(6,t+7) + (-7)(t)
F(6,t) = -77t - 188
Now we can substitute this value of F(6,t) into our formula for W,(1,0) to get the final answer:
W,(1,0) = -77t - 188 + 30
W,(1,0) = -77t - 158
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The table shows the number of cups of flour, f, that a bakery needs for the number of pound cakes that they make, p.
Pound Cakes, p 3 6 9 14
Cups of Flour, f 8. 25 16. 5 24. 75 ?
Part A
Which equation relates the number of cups of flour to the number of pound cakes that the bakery makes?
f = 2. 75p
f = 0. 343p
f = 2. 75p + 8. 25
f = 0. 343p + 16. 5
Part B
How many cups of flour are needed for 14 cakes?
4. 802
21. 302
38. 5
46. 75
A) The equation relates the number of cups of flour to the number of pound cakes that the bakery makes is f = 2.75p
B) Cups of flour are needed for 14 cakes is 38.5
A) The number of cups of flour, f, that a bakery needs for the number of pound cakes that they make, p is directly proportional to each other which can be written in form ,
f/p = 8.25/3
f = (8.25/3)×p
f = 2.75 p
The equation forms is f = 2.75p
B) Cups of flour are needed for 14 cakes
Here p = 14
by putting the value in the equation we get ,
f = 2.75(14)
f = 38.5
hence , cups of flour are needed for 14 cakes is 38.5
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In a nuclear disaster, there are multiple dangerous radioactive isotopes that can be detected. If 91.9% of a particular isotope emitted during a disaster was still present 6 years after the disaster, find the continuous compound rate of decay of this isotope. The continuous compound rate of decay of this isotope is
The first derivative of the implicit function given by x^(2/3) + y^(2/3) = 14 can be found using implicit differentiation. We take the derivative of both sides with respect to x and use the chain rule to differentiate the terms involving y:(2/3)x^(-1/3) + (2/3)y^(-1/3) * dy/dx = 0Then, we solve for dy/dx:dy/dx = -(x/y)^(1/3)This is the first derivative of the implicit function. To evaluate it at a specific point, we need to substitute the coordinates of that point into the equation above.
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The continuous compound rate of decay of this isotope is approximately 1.41%.
In order to find the continuous compound rate of decay of the radioactive isotope, we can use the formula:
N(t) = N0 * e^(-λt)
Where N(t) is the amount of the isotope present at time t, N0 is the initial amount of the isotope, λ is the continuous decay constant, and t is the time elapsed (in this case, 6 years).
We are given that 91.9% of the isotope is still present after 6 years, so:
0.919 = e^(-λ * 6)
To solve for λ, we can take the natural logarithm of both sides:
ln(0.919) = -6λ
Now, we can solve for the decay constant:
λ = -ln(0.919) / 6 ≈ 0.0141
So, the continuous compound rate of decay of this isotope is approximately 1.41%.
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Please help asap I need this until tmr
The finished table contains the following amount of cans per day:
- 4 1 - 5 2/5- 6 1 ¹/₂- 7 1 ³/₄- 8 2- 9 2¹/₄- 10 2¹/₂- 11 2³/₄- 12 3- 13 3¹/₈- 14 3³/₁₀- 15 3³/₄How to determine fractions?To find out how many cans of food per day to give a cat, divide the cat's weight by 4. If the weight is not a multiple of 4, the result will be a fraction, which represents a fraction of a can of food.
A 5-pound cat needs 5/4 or 1.25 cans of food per day. Simplify this fraction to 1 ¹/₄ or 1.25.
Others include:
6/4 = 1.5
7/4 = 1.75
8/4 = 2
9/4 = 2.25
10/4 = 2.5
11/4 = 2.75
12/4 = 3
13/4 = 3.25
14/4 = 3.5
15/4 = 3.75
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7. 7 puzzle time when do you put the cart before the horse
The phrase "putting the cart before the horse" refers to doing things in the wrong order or prioritizing less important tasks over more crucial ones.
In the context of the puzzle time question, the answer is: You should never put the cart before the horse, as it is essential to follow the proper sequence of actions to achieve the desired outcome effectively.
In the context of the puzzle time question, the phrase "putting the cart before the horse" implies that it is crucial to follow the proper sequence of actions or steps to solve the puzzle correctly.
By prioritizing less important tasks or skipping essential steps, the desired outcome may not be achieved, and the solution may be flawed.
To effectively solve the puzzle, it is essential to understand and follow the rules, guidelines, and necessary steps in the correct order. This ensures that each action builds upon the previous one and leads to a coherent solution.
By doing so, you avoid the mistake of putting the cart (less important tasks) before the horse (more crucial steps), leading to a successful and accurate solution.
In summary, the phrase "putting the cart before the horse" emphasizes the importance of following the correct sequence of actions or steps in any given task, including solving puzzles. It serves as a reminder to prioritize tasks appropriately to achieve the desired outcome effectively.
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Jesse can mow 3 yards in 8 hours. Jackson can mow twice as many yards per hour. What is the constant of proportionality between the number of yards Jackson can mow and the number of hours?
If Jesse can mow 3 yards in 8 hours. Jackson can mow twice as many yards per hour the constant of proportionality between the number of yards Jackson can mow and the number of hours is 3/4.
To find the constant of proportionality between the number of yards Jackson can mow and the number of hours, we can use the formula:
k = y/x
where k is the constant of proportionality, y is the number of yards, and x is the number of hours.
We know that Jesse can mow 3 yards in 8 hours, which means his rate of mowing is: 3 yards/8 hours = 3/8 yards per hour
We also know that Jackson can mow twice as many yards per hour as Jesse, which means his rate of mowing is:
2 * (3/8) yards per hour = 3/4 yards per hour
Now we can use the formula to find the constant of proportionality for Jackson:
k = y/x = (3/4) yards per hour / 1 hour = 3/4
Therefore, the constant of proportionality between the number of yards Jackson can mow and the number of hours is 3/4.
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Please hurry I need it ASAP
Answer:
20
Step-by-step explanation:
(x-3)+(8x+3)=180
9x=180
x=20
If a ball is dropped on the ground from a height of h m, then the ball reaches the ground with the
velocity V=4.43√h m/sec. Find the velocity with which a ball reaches the ground when it is dropped
from a height of 64 m.
The velocity with which a ball reaches the ground when it is dropped
from a height of 64 m is 35.44m/sec
How to determine the valueFrom the information given, we have that the equation representing the velocity of the ball is expressed as;
V = 4.43√h
Given that the parameters of the formula are;
V is the velocity of the ball from he ground.h is the height of the ball.Since the height of the ball from the ground is 64m, we have to substitute the value, we have;
V = 4.43√64
Find the square root of the value
V= 4.43(8)
Now, multiply both the values to determine the velocity, we get;
V = 35.44m/sec
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Solve for x. −43x 16<79 drag and drop a number or symbol into each box to correctly complete the solution.
-43x < 79 - 16
How can the inequality −43x + 16 < 79 be solved?To solve the inequality −43x + 16 < 79, we need to isolate the variable x.
Let's begin by subtracting 16 from both sides of the inequality:
−43x + 16 - 16 < 79 - 16
Simplifying the equation, we have:
−43x < 63
Next, we divide both sides of the inequality by -43. However, when we divide by a negative number, the direction of the inequality sign will be flipped:
x > 63 / -43
Simplifying further, we have:
x > -1.465
Therefore, the solution to the inequality is x > -1.465.
In interval notation, we can represent the solution as (-1.465, ∞), indicating that x is greater than -1.465 and extends indefinitely towards positive infinity.
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Angad adds 20 to it, then doubles it and gets an answer of 53. what was the original number?
The original number was 17 to which when Angad adds 20, then doubles it and gets an answer of 53.
To solve this problem, we need to work backwards from the final answer. If Angad added 20 to the original number, we can subtract 20 from 53 to get 33. This means that after Angad doubled the number, he had 33.
To find the original number, we need to undo the doubling process. If Angad had 33 after doubling the number, we can divide 33 by 2 to get the original number.
33 divided by 2 equals 16.5. However, we know that the original number must be a whole number since we cannot add 20 to a decimal. Therefore, we can round up to the nearest whole number to get 17.
So, the original number was 17.
In summary, to find the original number, we worked backwards from the final answer and undid the steps that Angad took. We subtracted 20 to undo the addition, then divided by 2 to undo the doubling. We rounded up to the nearest whole number since the original number must be a whole number.
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A report states that 1% of college degrees are in mathematics. A researcher doesn't believe this is correct. He samples 12,317 graduates and finds that 148 have math degrees. Test the claim at 0. 10 level of significance
We have evidence to suggest that the true percentage of college degrees in mathematics is different from 1%.
What is null hypothesis?The null hypothesis is a type of hypothesis that explains the population parameter and is used to examine if the provided experimental data are reliable.
To test the claim that the percentage of college degrees in mathematics is not 1%, we can use a hypothesis test. Let's assume the null hypothesis is that the true percentage of college degrees in mathematics is 1%, and the alternative hypothesis is that it is different from 1%.
- Null hypothesis: The percentage of college degrees in mathematics is 1%.
- Alternative hypothesis: The percentage of college degrees in mathematics is different from 1%.
We can use a binomial distribution to model the number of graduates with math degrees in a sample of 12,317. Under the null hypothesis, the expected number of graduates with math degrees is:
Expected value = sample size * probability of math degrees = 12,317 * 0.01 = 123.17
Since we are testing at a 0.10 level of significance, the critical values for a two-tailed test are ±1.645 (using a standard normal distribution table).
The test statistic can be calculated as:
z = (observed value - expected value) / standard deviation
The standard deviation of the binomial distribution can be calculated as:
√(sample size * probability of success * (1 - probability of success))
So,
standard deviation = √(123.17 * 0.01 * 0.99) = 1.109
The observed value is 148.
The test statistic is:
z = (148 - 123.17) / 1.109 = 22.38
Since the absolute value of the test statistic is greater than 1.645, we can reject the null hypothesis at the 0.10 level of significance.
Therefore, we have evidence to suggest that the true percentage of college degrees in mathematics is different from 1%.
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TASK CARD 1
-2x³
a) Write the polynomial in standard form
b) Determine the degree
c) Determine the lead coefficient
Answer: The given polynomial is -2x³.
a) To write the polynomial in standard form, we arrange the terms in descending order of degrees:
-2x³
b) The degree of a polynomial is the highest exponent of the variable in the polynomial. In this case, the degree of the polynomial is 3.
c) The lead coefficient is the coefficient of the term with the highest degree. In this case, the lead coefficient is -2.
Step-by-step explanation:
Q 28 : A new school has built lockers for its students. All the digits from 0 to 9, together with
the letters A to Y, have been used to identify the lockers. Only 4 digits have been used to
identify the lockers with the letter Z. How many lockers have been built in this school, if each
locker is identified by one letter and one digit?
If each locker is identified by one letter and one digit, the total number of lockers built in the school is 229.
There are 26 letters in the alphabet (A to Z), and if each locker is identified by one letter and one digit, then there are a total of 26 × 10 = 260 possible locker identifications using the letters A to Y and digits 0 to 9.
Out of these, there are 4 digits used to identify the lockers with the letter Z. So, there are 10 − 1 = 9 digits left to use for the remaining lockers, as we cannot use the digit already used for the lockers with the letter Z.
Similarly, there are 25 letters left to use for the remaining lockers, as we cannot use the letter Z.
Therefore, the number of remaining lockers is 9 × 25 = 225. Adding the 4 lockers with the letter Z, the total number of lockers built in the school is 225 + 4 = 229.
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Part D
The rectangular bases of the treasure box will be cut from wooden planks
4 1/8 feet long and 4 1/8 feet wide. How many planks will Mr. Penny need for his
18 students to each
make one treasure box?
Answer:
Step-by-step explanation:
A restaurant needs a block of ice that is exactly 480 cubic inches in volume
The height of the ice block must be 10 inches. Pls help is this right ????
The height of the ice block must be 10 inches, the length and width could be any combination of dimensions that multiply together to equal 48 square inches.
Explain volume?The overall number of cube units that the cube totally occupies is the definition of a cube's volume. Volume is simply the total amount of space an object takes up. The cube's volume can be calculated using the formula a3 where an is the cube's edge.
given,
To check if the height of the ice block must be 10 inches to have a volume of 480 cubic inches, we can use the formula for the volume of a rectangular solid:
V = l * w * h
where l represents the length, w represents the measurement of width, while h is the peak, and V is the volume.
Since the volume is given as 480 cubic inches, and the height is specified as 10 inches, we can write:
480 = l * w * 10
Dividing both sides by 10, we get:
48 = l * w
This means that the product of the length and width must be equal to 48 square inches in order for the block of ice to have a volume of 480 cubic inches with a height of 10 inches.
There are many possible dimensions that satisfy this condition. For example, the block of ice could have dimensions of 8 inches by 6 inches by 10 inches, or 12 inches by 4 inches by 10 inches, or 16 inches by 3 inches by 10 inches, and so on.
Therefore, while the height of the ice block must be 10 inches, the length and width could be any combination of dimensions that multiply together to equal 48 square inches.
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