The two aircraft are 128.535 far away.
What is the distance formula?
The d-distance between two places is calculated using the distance formula. The Euclidean distance formula is another name for the formula used to calculate the separation between two points on a two-dimensional plane.
Here, we have
Given: Two radars A and B are 80km apart and B is due to the east of A. One aircraft is on a bearing of 030 degrees from A and 346 degrees from B. A second aircraft is on a bearing 325 degrees from A and 293 degrees from B.
Calculating the Slope of AC, tan60° = 1.732
Calculating the Slope of BC, tan104° = -4.011
Calculating the Slope of AD, tan125° = -1.482
Calculating the Slope of BD, tan157° = -0.424
When pointing C intercepts:
y₁ = 1.732x₁....(1)
y₁ = -4.011(x₁-80)....(2)
Solving equation(1) and(2) , we get
x₁ = 55.873
y₁ = 96.772
When point D intercepts:
y₂ = -1.428x₂....(3)
y₂ = 0.424(x₂-80)....(4)
Solving equations (3) and (4), we get
x₂ = 18.315
y₂ = -26.154
Calculating distance by applying the distance formula:
D = [tex]\sqrt{(y_2-y_1)^2+(x_2-x_1)^2}[/tex]
D = [tex]\sqrt{(-26.154-96.772)^2+(18.315-55.873)^2}[/tex]
D = [tex]\sqrt{4986.9019+1410.6033}[/tex]
D = 128.535
Hence, the two aircraft are 128.535 far away.
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On the set of axes below, solve the following system of equations graphically and state the coordinates of all points in the solution set.
The solution to the system of equations shown above is the ordered pairs [-2, -9] and [3, -4].
How to graphically solve this system of equations?In order to graph the solution to the given system of equations on a coordinate plane, we would use an online graphing calculator to plot the given system of equations and then take note of the point of intersection;
y = -x² + 2x - 1 ......equation 1.
2x - 2y = 14 ......equation 2.
Based on the graph shown in the image attached above, we can logically deduce that the solution to this system of equations is the point of intersection of the lines on the graph representing each of them, which is given by the ordered pairs (-2, -9) and (3, -4).
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A rectangle with length n is inscribed in a circle of radius 9. Find an expression for the area of the rectangle in terms of n
Using pythagorean theorem the area of the rectangle in terms of n is given by A = n√(324 - n^2).
In the given scenario, we have a circle with a diameter that is twice the length of the radius, which is stated as 18. The diagonal of the rectangle is also the diameter of the circle, so it measures 18. Let's assume the width of the rectangle as 'w'. By applying the Pythagorean theorem, we can establish the following relationship:[tex]n^2 + w^2 = 18^2[/tex] = 324, where 'n' represents the length of the rectangle.
To solve for 'w', we rearrange the equation: [tex]w^2 = 324 - n^2.[/tex] This equation allows us to calculate the width 'w' of the rectangle when we know the length 'n'.
The area of the rectangle, denoted as 'A', is given by the formula A = nw, where 'n' is the length and 'w' is the width of the rectangle. By substituting the expression for w^2, we obtain: A =[tex]n\sqrt(324 - n^2).[/tex]
This equation represents the relationship between the length 'n' and the area 'A' of the rectangle, taking into account the given information about the diameter of the circle, which is also the diagonal of the rectangle. By solving for 'n' and substituting it into the formula, we can determine the area of the rectangle.
Let the width of the rectangle be w, then by the Pythagorean theorem, we have:
[tex]n^2 + w^2 = 18^2[/tex] = 324
Solving for w, we get: [tex]w^2 = 324 - n^2[/tex]
The area of the rectangle is given by:
A = nw
Substituting the expression for w^2, we get:
A =[tex]n\sqrt(324 - n^2)[/tex]
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Find the particular solution for: 1 f"(x) = 0.25 x 7, = f'(4) = = and f(0) = 2. 8
Particular solution is: f(x) = (0.25/24) x⁹ - 6553.3333 x + 2
How to find the particular solution for the given differential equation?We need to integrate it twice. Integrating once gives us:
f'(x) = (0.25/3) x⁸ + C1
where C1 is the constant of integration. Using the initial condition f'(4) = 8, we can solve for C1:
8 = (0.25/3) 4⁸ + C1
C1 = 8 - (0.25/3) 4⁸
C1 = -6553.3333
Integrating again gives us:
f(x) = (0.25/24) x⁹ + C1 x + C2
where C2 is another constant of integration. Using the initial condition f(0) = 2, we can solve for C2:
2 = (0.25/24) 0⁹ + C1 0 + C2
C2 = 2
So the particular solution is:
f(x) = (0.25/24) x⁹ - 6553.3333 x + 2
Note that we did not need to use the second initial condition, f'(4) = 8, to find the particular solution. This is because it was already used to find the constant of integration C1.
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What is the average rate if change over the domain -1
I'm sorry, but the domain of a function is usually specified as an interval or range of values, rather than a single point. To calculate the average rate of change of a function over a given domain, we need to know the function itself and the endpoints of the domain.
If you provide me with more details about the function and the domain, I can help you calculate the average rate of change.
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It takes Fena Tailoring 3 hr of cutting and 6 hr of sewing to make a tiered silk organza bridal dress. It takes 6 hr of cutting and 3 hr of sewing to make a lace sheath bridal dress. The shop has at most 30 hr per week available for cutting and at most 33 hr per week for sewing. The profit is ?$330 on an organza dress and ?$190 on a lace dress. How many of each kind of bridal dress should be made each week in order to maximize? profit? What is the maximum? profit?
Answer :The maximum profit is $1,650 when making 5 organza dresses and no lace dresses per week.
Explanation:
Let x represent the number of organza dresses, and y represent the number of lace dresses.
The time constraint for cutting:
3x + 6y ≤ 30
The time constraint for sewing:
6x + 3y ≤ 33
The profit function to maximize is:
P(x, y) = 330x + 190y
Using these constraints,
3x + 6y ≤ 30
6x + 3y ≤ 33
x ≥ 0
y ≥ 0
Optimal solution:
The corner points of the feasible region are (0,0), (0,5), (3,3), and (5,0). Calculate the profit for each point:
P(0,0) = 0
P(0,5) = 950
P(3,3) = 1,320
P(5,0) = 1,650
The maximum profit is $1,650 when making 5 organza dresses and no lace dresses per week.
Select ALL the correct answers. Richard is renting a bike. The cost of renting a bike for the first hour is $7. He is charged $2.50 for every additional hour of renting the bike. Select all the functions that can be used to find the total amount that Richard is charged, f(n), for renting the bike for n hours. f ( n ) = 2.5 n + 7 f ( n ) = 2.5 n + 4.5 f ( 1 ) = 7 ; f ( n ) = f ( n − 1 ) + 2.5 , for n ≥ 2 f ( n ) = 4.5 n + 2.5 f ( 1 ) = 2.5 ; f ( n ) = f ( n − 1 ) + 7 , for n ≥ 2
The function that can be used to find the total amount is f(n) = 7 + (n - 1) * 2.5
Selecting the functions that can be used to find the total amountFrom the question, we have the following parameters that can be used in our computation:
The cost of renting a bike for the first hour is $7. He is charged $2.50 for every additional hour of renting the bike.This means that
f(n) = First hour + (n - 1) * Additional hour
Substitute the known values in the above equation, so, we have the following representation
f(n) = 7 + (n - 1) * 2.5
Hence, the function that can be used to find the total amount is f(n) = 7 + (n - 1) * 2.5
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The points (1,5), (5,10), (7,8), and (8,1) are on the graph of the function p. Which expression belo gives the average rate of change of the function p on 5 less than or equal x less than or equal 8
Answer:
Step-by-step explanation:
Since it is x that is bound by 5≤x≤8, you should use the points (5,10) and (8,1), since a coordinate is written as (x,y).
Then, use the formula for slope, as the average rate of change means find the slope, [tex]\frac{y2-y1}{x2-x1}[/tex]
thus, plug in
[tex]\frac{1-10}{8-5}[/tex], and you get -9/3, or -3. :)
A cook is adding soup to a 10-liter
capacity pot. The equation
y = 1.5x + 2.5 relates the liters
of soup y added to the pot in
x minutes.
Part A
How much soup was in the pot to
start with?
____liters
Part B
At what rate does the cook fill
the pot?
_______liters per minute
The required answers are 2.5 liters and 1.5 liters per minute.
How to deal with the equation of variable at different value?Part A:
If we know that the pot has a capacity of 10 liters, we can use the equation y = 1.5x + 2.5 to determine how much soup was in the pot to start with, since at x = 0 minutes, no soup has been added yet.
Substituting x = 0 in the equation, we get:
y = 1.5(0) + 2.5
y = 2.5
Therefore, the pot had 2.5 liters of soup to start with.
Part B:
The equation y = 1.5x + 2.5 tells us how much soup is added to the pot in x minutes, so the rate at which the cook fills the pot can be found by taking the derivative of y with respect to x:
dy/dx = 1.5
Therefore, the rate at which the cook fills the pot is 1.5 liters per minute.
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Reina’s greenhouse is shaped like a square pyramid with four congruent equilateral triangles for its sides. All of the edges are 6 feet long. What is the total surface area of the greenhouse including the floor? Round your answer to the nearest hundredth.
____ft2
With all of the edges 6 feet long, the total surface area of the greenhouse including the floor is approximately 98.39 ft².
To find the total surface area of Reina's greenhouse, we'll need to calculate the area of the equilateral triangular sides and the square base.
1. Equilateral triangular sides:
There are four congruent equilateral triangles with edges of 6 feet each. To find the area of one triangle, we can use the formula A = (s² * √3) / 4, where A is the area and s is the side length.
A = (6² * √3) / 4 = (36 * √3) / 4 = 9√3 square feet
Since there are four triangles, the total area of the triangular sides is 4 * 9√3 = 36√3 square feet.
2. Square base:
The base is a square with side lengths of 6 feet. To find the area, we can use the formula A = s².
A = 6² = 36 square feet
Now, let's add the area of the triangular sides and the square base
Total surface area = 36√3 + 36 ≈ 98.39 ft² (rounded to the nearest hundredth)
So, the total surface area of the greenhouse including the floor is approximately 98.39 ft².
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Bailey has a sheet of plywood with four right angles. She saws off one of the angles and turns the plywood one-half turn clockwise
How many right angles are there on the plywood now?
Enter the correct answer in the box.
Answer:For each figure, which pair of angles appears congruent? How could you check?
Figure 1
3 angles. Angle A B C opens to the right, angles D E F and G H L open up.
Figure 2
3 angles. Angles M Z Y and P B K open up, angle R S L opens to the right.
Figure 3
Identical circles. Circle V with central angle GVD opens to the right, circle J with central angle LJX opens to the left and circle N with central angle CNE opens up.
Figure 4
A figure of 3 circles. H. B. E.
Step-by-step explanation:
A negatively charged balloon moves close to another balloon. They then repel each other. What can be said about the other balloon? (2 points)
A: Both balloons have a positive charge.
B: It has a negative charge.
C: The balloon is uncharged.
D: There is a positive charge.
The repulsion between two negatively charged objects is an indication that the other object must be negatively charged. Thus, the correct answer is B: It has a negative charge.
This is due to the fact that like charges repel each other, while opposite charges attract each other. In this case, the negatively charged balloon repels the other balloon, indicating that the other balloon is also negatively charged. So, the correct answer is B).
The other options are incorrect. Option A is incorrect because both balloons cannot be positively charged as they would attract each other, not repel. Option C is incorrect because an uncharged object would not repel a negatively charged object. Option D is incorrect because a positively charged object would attract the negatively charged balloon, not repel it.
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You want to make a banner that says WELCOME HOME. You want the letters to be 2 feet high. You make a sketch in which the letters are 2 inches high. The entire phrase in your sketch is 20 inches long. What length of paper should you buy?
Answer:If the letters are 2 inches high in the sketch, and you want them to be 2 feet high in reality, that means you need to scale up the letters by a factor of 12 (since 1 foot = 12 inches).
So the new height of each letter will be:
2 inches/letter × 12 = 24 inches/letter
And the new length of the banner will be:
20 inches/banner × 12 = 240 inches/banner
To find out how much paper to buy, you need to know the width of the paper you'll be using. Let's say the paper is 36 inches wide (3 feet). In that case, you'll need to buy:
240 inches/banner ÷ 36 inches/roll = 6.67 rolls of paper
Since you can't buy a fraction of a roll of paper, you should round up to 7 rolls of paper to ensure you have enough.
Step-by-step explanation:
7. The table shows the linear relationship between the total amount Mrs. Jacobs will be
charged for a skating party and the number of children attending.
Which equation best represents y, the total amount in dollars Mrs. Jacobs will be
charged for
x number of children attending the skating party?
Based on the information given in the table, we can see that there is a linear relationship between the total amount Mrs. Jacobs will be charged for a skating party and the number of children attending. This means that we can use a linear equation to represent this relationship.
To find the equation, we need to determine the slope (m) and y-intercept (b) of the line. We can do this by using two points from the table: (10, 100) and (20, 180).
The slope (m) can be calculated using the formula:
m = (y2 - y1) / (x2 - x1)
Plugging in the values, we get:
m = (180 - 100) / (20 - 10) = 8
The y-intercept (b) can be found by plugging in one of the points and the slope into the equation:
y = mx + b
Using the point (10, 100) and the slope we just calculated, we get:
100 = 8(10) + b
Solving for b, we get:
b = 20
Therefore, the equation that best represents y, the total amount in dollars Mrs. Jacobs will be charged for x number of children attending the skating party, is:
y = 8x + 20
This equation shows that for every additional child that attends the skating party, Mrs. Jacobs will be charged an additional $8, and the initial cost of the party is $20.
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Mayumi was asked to determine whether quadrilateral rstu is a trapezoid given the vertices r(-2, 3), s(1, 4), t(1, -4) and u(-2, 1). she noticed that the slopes of ru and st are undefined, so she concluded that the quadrilateral could not be a trapezoid. do you agree? explain.
No, I do not agree with Mayumi's conclusion that the quadrilateral RSTU cannot be a trapezoid just because the slopes of RU and ST are undefined.
RSTU is a trapezoid with RU and ST are parallel and have the same x-coordinates.
A trapezoid is defined as a quadrilateral with at least one pair of parallel sides.
The fact that the slopes of RU and ST are undefined does not necessarily mean that they are not parallel.
As vertical lines have undefined slopes and are parallel to each other.
To determine if RSTU is a trapezoid,
Mayumi should check if any pair of opposite sides are parallel.
The slopes of the two pairs of opposite sides RS and TU, and RU and ST and check if they are equal.
Slope of RS = (4 - 3)/(1 - (-2))
= 1/3
Slope of TU = (1 - (-4))/(-2 - 1)
= -5/3
Slope of RU is undefined (vertical line)
Slope of ST is undefined (vertical line)
Since the slopes of RS and TU are not equal, they are not parallel.
The slopes of RU and ST are undefined does not give us any information about their parallelism.
Check at other properties of the quadrilateral to determine if they are parallel.
One property is the coordinates of the points.
If we draw the quadrilateral, RS and TU are not parallel, but RU and ST are parallel and have the same x-coordinates.
Therefore, quadrilateral RSTU is a trapezoid with bases RS and TU, and legs RU and ST.
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X is 6 more than twice the value of Y and other equation is 1/2x+3=y what is the solution to puzzle
Let’s solve this system of equations. From the first equation, we have x = 6 + 2y. Substituting this into the second equation, we get 1/2(6 + 2y) + 3 = y. Solving for y, we get y = -6. Substituting this value of y into the first equation, we get x = 6 + 2(-6) = -6. So the solution to the system of equations is (x,y) = (-6,-6).
HELP PLEASE, DUE IN 17 MINUTES!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
A bag of paper clips contains:
. 9 pink paper clips
• 7 yellow paper clips
• 5 green paper clips
• 4 blue paper clips
A random paper clip is drawn from the bag and replaced 50 times. What is a
reasonable prediction for the number of times a yellow paper clip will be
drawn?
A. 5
B. 8
C. 10
D. 12
f(x)=(2−x)(x+4)^2(A) Find all critical values of f. If there are no critical values,enter -1000. If there are more than one, enter them separated bycommas.Critical value(s) = ______________(B
The critical values are x = -4 and x = 2.
Given the function f(x) = (2-x)(x+4)^2, we need to find the critical values.
Critical values are the points where the derivative of the function is either zero or undefined.
Step 1: Find the derivative of f(x). f'(x) = d/dx((2-x)(x+4)^2)
Step 2: Apply the product rule, which states d(uv) = u*dv + v*du,
where u = (2-x) and v = (x+4)^2. f'(x) = (2-x)*d/dx((x+4)^2) + (x+4)^2*d/dx(2-x)
Step 3: Compute the individual derivatives. f'(x) = (2-x)*(2(x+4)) + (x+4)^2*(-1)
Step 4: Simplify the expression. f'(x) = -2(x+4)^2 + 4(x+4)(2-x)
Step 5: Set f'(x) equal to 0 and solve for x. 0 = -2(x+4)^2 + 4(x+4)(2-x)
Step 6: Factor out a common term. 0 = 2(x+4)[-1(x+4) + 2(2-x)]
Step 7: Solve for x. 0 = 2(x+4)(-x+2) x = -4, 2 The critical values are x = -4 and x = 2.
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If a big sheet of white paper has a red dot in the center, the red dot is the ______, and the white space is the ______.
If a big sheet of white paper has a red dot in the center, the red dot is the figure or object, and the white space is the ground or background.
In visual perception, the figure-ground relationship is the process by which our brains distinguish an object( the figure) from its surroundings( the ground).
This relationship is essential in our capability to fete and make sense of the visual world around us. The figure is the object of interest or focus, while the ground is the background against which it stands out.
The red dot becomes the focal point or center of attention, while the white space around it provides environment and contrast, making the dot more visible and commanding.
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Suppose $40,000 is deposited into an account paying 2. 5% interest, compounded continuously.
How much money is in the account after eight years if no withdrawals or additional deposits are made?
The formula for calculating the amount of money in an account with continuous compounding is:
[tex]A = Pe^{(rt)}[/tex]
where A is the amount of money in the account, P is the principal (initial deposit), e is the mathematical constant e (approximately equal to 2.71828), r is the interest rate (expressed as a decimal), and t is the time (in years).
Plugging in the given values, we get:
A =[tex]40000 * e^{(0.025 * 8)[/tex]
Using a calculator, we find that [tex]e^{(0.025 * 8)[/tex] is approximately 1.2214, so:
A = 40000 * 1.2214 = $48,856.12
Therefore, the amount of money in the account after eight years with continuous compounding is $48,856.12.
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Can someone PLEASE help me ASAP? It’s due today!! I will give brainliest if it’s done and correct.
The number of different sandwiches that can be created with two different meats is D. 6.
How to find the number of sandwiches ?The number of different sandwiches that can be created with two different meats can be found by using the combination formula: nCr = n! / r!(n-r)!
In this case, we have 4 options for the first meat and 3 options for the second meat (since we cannot repeat the first meat). Therefore, the number of different sandwiches is:
4C2 = 4! / 2!(4-2)! = 6
So there are 6 different sandwiches that can be created with two different meats.
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The relative growth rate of a biomass at time t, R, is related to the concentration of a
substrate s at time t by the equation.
R(s) = cs / k+s
where c and k are positive constants.
What is the relative growth rate of the biomass if there is no substrate present?
If there is no substrate present, the concentration of s would be 0. The relative growth rate of biomass at time t, R, is related to the concentration of a substrate s at time t by the equation R(s) = cs / (k+s), where c and k are positive constants.
To find the relative growth rate of the biomass if there is no substrate present, we need to set the concentration of the substrate, s, to 0. Using the given equation, we can substitute 0 for s:
R(0) = c(0) / k + 0
R(0) = 0 / k
R(0) = 0
Therefore, the relative growth rate of the biomass would be 0 if there is no substrate present.
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Find ln 0. 732 to four decimal places
A.
-0. 5227
B.
-0. 3120
C.
-0. 4624
D.
-0. 4719
Using a calculator, we can evaluate ln 0.732 to four decimal places. The correct answer is option D, -0.4719.
The natural logarithm of a number is the logarithm to the base e (approximately 2.71828), and ln 0.732 is the natural logarithm of the number 0.732.
To find the value of ln 0.732, we simply input the number into the calculator and hit the ln key.
The result is approximately -0.4719, rounded to four decimal places. Therefore, the correct answer is D, -0.4719.
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The area of a triangle is (27 + 13sqrt(2)) square feet. if the length of the base is (6 + sqrt(2)) feet, find the height of the triangle in simplest radical form.
If The area of a triangle is (27 + 13sqrt(2)) square feet. if the length of the base is (6 + sqrt(2)) feet, then the triangle's height is (27 - 13sqrt(2)) / 17 feet.
We are given the area A and the length of the base b. We can use this information to solve for the height h as follows:
A = (1/2)bh
2A = bh
h = (2A)/b
Substituting the given values, we get:
h = (2(27 + 13sqrt(2))) / (6 + sqrt(2))
We can simplify this expression by rationalizing the denominator as follows:
h = [(2(27 + 13sqrt(2))) / (6 + sqrt(2))] * [(6 - sqrt(2))/(6 - sqrt(2))]
h = [(54 - 26sqrt(2)) / (34)]
h = (27 - 13sqrt(2)) / 17
Therefore, the triangle's height is (27 - 13sqrt(2)) / 17 feet.
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let s be a finite minimal spanning set of a vector space v. that is, s has the property that if a vector is removed from s, then the new set will no longer span v.
A finite minimal spanning set of a vector space V is a set S that satisfies the following properties:
S is a spanning set of V, i.e., every vector in V can be expressed as a linear combination of vectors in S.S is finite, i.e., it contains a finite number of vectors.S is minimal, i.e., no vector can be removed from S without destroying the spanning property.In other words, S is the smallest set of vectors that can be used to generate V. If we remove any vector from S, the resulting set will not be able to generate V anymore.
The concept of a finite minimal spanning set is important in linear algebra, particularly in the context of basis and dimension. A basis is a linearly independent spanning set of a vector space V.
A finite minimal spanning set is also a basis of V. The dimension of a vector space is the number of vectors in any basis of V. Since a finite minimal spanning set is a basis, the dimension of V is equal to the number of vectors in S.
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Full Question: Let S be a finite minimal spanning set of a vector space V. That is, S has the property that if a vector is removed from S, then the new set will no longer span V. Prove that S must be a basis for V.
Arnold owns a hat with a circular brim. The brim has a diameter of 12 inches. What is the circumference of the brim of Arnold's hat, in inches? Use 3. 14 for the value of π. Enter the answer as a decimal in the box
The circumference of the brim of Arnold's hat is 37.68 inches.
What is circle?
A circle is a geometric shape that consists of all points in a plane that are equidistant from a fixed point called the center. It can also be defined as the set of points that are a fixed distance (called the radius) away from the center point. The distance around the circle is called its circumference, and the distance across the circle passing through the center is called its diameter.
The circumference of a circle can be calculated by the formula C = πd, where C is the circumference, π is the mathematical constant pi, and d is the diameter of the circle.
In this case, the diameter of the brim is 12 inches, so we can substitute that value into the formula:
C = πd
C = 3.14 x 12
C = 37.68
Therefore, the circumference of the brim of Arnold's hat is 37.68 inches.
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Mrs.Kwon made costumes for her children school play. She used 5 1/2 yards fabric for sun’s costume and 7 7/8 yards for Jin’s costume . how much fabric did she use in all ?complete question 1-3 draw a diagram to represent a problem
Mrs. Kwon used 107/8 yards of the total fabric length for Sun's and Jin's costume.
Firstly we will convert the mixed fraction to fraction. The length of fabric of Sun's costume = ((5×2)+1)/2
Length of fabric of Sun's costume = 11/2 yards
The length of fabric of Jin's costume = ((8×7)+7)/8
Length of fabric of Jin's costume = 63/8 yards
Total length of fabric used = Length of fabric of Sun's costume + Length of fabric of Jin's costume
Total length of fabric used = 11/2 + 63/8
Taking LCM we get-
Total length of fabric used = (11×4)+63/8
Multiply the values
Total length of fabric used = 44 + 63/8
Add the digits
Total length = 107/8 yards
Hence, she used 107/8 yards total fabric.
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Savannah recorded the average rainfall amount, in inches, for two cities over the course of 6 months. Show your work
City A: {2.5, 3, 6, 1.5, 4, 1}
City B: {4, 7, 3.5, 4, 3.5, 2}
What is the mean monthly rainfall amount for each city?
What is the mean absolute deviation (MAD) for each city? Round to the nearest tenth.
What is the median for each city?
Hello, I am Alyssa Ann Verrett.
Put the numbers in order:
City A: {2, 3.5, 4, 4, 5, 5.5}
City B: {3.5, 4, 5, 5.5, 6, 6}
a)
The mean monthly rainfall amount for city A: 4 in;
The mean monthly rainfall amount for city B: 5 in;
b)
The MAD monthly rainfall amount for city A: 0.8 in;
The MAD monthly rainfall amount for city B: 0.8 in;
c)
The median monthly rainfall amount for city A: 4 in;
The median monthly rainfall amount for city A: 5.25 in;
Step-by-step explanation:
a) The general definition of mean of a set X is:
mean = (x₁ + x₂ + x₃ + ... xₙ)/n
For City a:
mean = (4+3.5+5+5.5+4+2)/6 = 4
For City b:
mean = (5+6+3.5+5.5+4+6)/6 = 5
b) The general definition of mean absolute deviation of a set X is:
MAD = (|x₁-mean| + |x₂-mean| + |x₃-mean| + ... + |xₙ-mean|)/n
For City a:
MAD = ( |4-4| + |3.5-4| + |5-4| + |5.5-4| + |4-4| + |2-4| )/6 = (0 + 0.5 + 1 + 1.5 + 0 + 2)/6 = 5/6 =0.8
For City b:
MAD = ( |5-5| + |6-5| + |3.5-5| + |5.5-5| + |4-5| + |6-5| )/6 = (0 + 1 + 1.5 + 0.5 + 1 + 1)/6 = 5/6 = 0.8
c) The general definition of median depends on the quantity of elements in the set X and it represents the middlemost value of the set:
When the quantity is odd:
median= x₍ₙ₊₁₎/₂
When the quantity is even:
median= (xₙ/₂ + x ₙ₊₂/₂) /2
For City A:
median = 2, 3.5, 4, 4, 5, 5.5 = (4 + 4) / 2 = 4
For City B:
median = 3.5, 4, 5, 5.5, 6, 6 = (5 + 5.5) / 2 = 5.25
4 (23) A doll maker's profit function is given by P(x) = (x-4).* - 4 (4 pts) where OCX5 3.9 find the following: (a) The critical number(s) (if any) [ Hint: Simplify the function BEFORE you take the derivative of the function] (b) The production levels in interval notation where the function is decreasing. (4pts)
The profit function P(x) is given as P(x) = (x-4)^2 - 4. To find critical numbers, the derivative of P(x) is calculated and set to zero. The intervals where the function is decreasing are determined by analyzing the sign of P'(x) on the intervals determined by the critical number(s).
Let's address each part step by step:
(a) First, let's simplify the profit function, P(x), which is given by P(x) = (x - 4)^2 - 4. To find the critical numbers, we need to find the derivative of the profit function with respect to x and set it to zero.
P'(x) = d/dx [(x - 4)^2 - 4]
P'(x) = 2(x - 4)
Now, set P'(x) to zero and solve for x:
2(x - 4) = 0
x - 4 = 0
x = 4
So, there is one critical number, x = 4.
(b) To determine the intervals where the function is decreasing, we need to analyze the sign of P'(x) on the intervals determined by the critical number(s).
For x < 4, P'(x) = 2(x - 4) < 0, which means the function is decreasing.
For x > 4, P'(x) = 2(x - 4) > 0, which means the function is increasing.
In interval notation, the function is decreasing on the interval (-∞, 4). Keep in mind that the original function has a domain restriction of 0 ≤ x ≤ 5, so considering that, the production levels where the profit function is decreasing are on the interval (0, 4).
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Kelsey's favorite crackers are available in two different sizes. Which coupon should Kelsey use to pay the lower price per ounce for the crackers?
Using the coupon that offers a $0.50 discount on the larger package would yield the lowest price per ounce at $0.1875. Kelsey should use this coupon to get the best value for her favorite crackers.
Kelsey has two options when it comes to purchasing her favorite crackers, and she needs to determine which coupon will result in the lowest price per ounce. To make an informed decision, Kelsey should compare the price per ounce of both cracker sizes and apply the appropriate coupon accordingly.
First, Kelsey should find the price per ounce for each size by dividing the total price of the package by the total number of ounces in the package. For example, if the smaller package costs $2.00 and contains 8 ounces of crackers, the price per ounce would be $2.00 / 8 = $0.25 per ounce. Similarly, if the larger package costs $3.50 and contains 16 ounces, the price per ounce would be $3.50 / 16 = $0.21875 per ounce.
Next, Kelsey should determine the discount offered by each coupon and calculate the new price per ounce after applying the respective coupon. For instance, if one coupon provides a 10% discount on the smaller package, the new price per ounce would be $0.25 * (1 - 0.1) = $0.225 per ounce. If another coupon offers a $0.50 discount on the larger package, the new price per ounce would be ($3.50 - $0.50) / 16 = $0.1875 per ounce.
Finally, Kelsey should compare the adjusted price per ounce for both packages and select the coupon that results in the lowest price per ounce. In this example, using the coupon that offers a $0.50 discount on the larger package would yield the lowest price per ounce at $0.1875. Therefore, Kelsey should use this coupon to get the best value for her favorite crackers.
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Five years ago, a county lottery official conducted a very extensive (and expensive) study to determine the average age of lottery players in the county. From the data, he estimated the true age to be about 50 years. Five years later, the lottery official wants to know if the average age is now different from 50 years. He plans to conduct a smaller (and less expensive) survey of lottery players. From a random sample of 81 players from the county, the average age is 48. 7 years with a standard deviation of 8. 5 years.
(a) is there convincing evidence at the a = 0. 05 significance level that the present-day average age of all lottery players in the county is different from 50 years.
(b) Referring to your conclusion in part fa), what type of error may have been made? Describe the error in the context of this study
a. There is insufficient evidence to conclude that the average age of all lottery players in the county is different from 50 years at the 5% significance level.
b. Referring to the conclusion in part (a), the type of error that may have been made is a type II error, where we fail to reject a false null hypothesis.
(a) To test if the present-day average age of all lottery players in the county is different from 50 years, we can use a one-sample t-test with the null hypothesis:
H0: μ = 50
And the alternative hypothesis:
Ha: μ ≠ 50
Where μ is the population mean age of lottery players.
We have a sample size of n = 81, sample mean x = 48.7, and sample standard deviation s = 8.5. We can calculate the t-statistic as:
t = (x - μ) / (s / √n) = (48.7 - 50) / (8.5 / √81) = -1.29
Using a t-distribution table with 80 degrees of freedom (df = n - 1), we find the critical values to be ±1.990 at a significance level of α = 0.05 (two-tailed test).
Since the calculated t-statistic (-1.29) does not fall outside the critical values, we fail to reject the null hypothesis. There is insufficient evidence to conclude that the average age of all lottery players in the county is different from 50 years at the 5% significance level.
(b) Referring to the conclusion in part (a), the type of error that may have been made is a type II error, where we fail to reject a false null hypothesis. In other words, there may not be enough evidence to conclude that the population mean age is different from 50 years, even if it truly is.
The error in this context means that the lottery official may have missed an opportunity to update their estimate of the average age of all lottery players in the county.
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