To find the price that will give the greatest profit, we need to maximize the profit function, which is given by the difference between the revenue and the cost. Revenue is equal to the price multiplied by the number of copies sold, while cost is equal to the cost per copy multiplied by the number of copies sold. So, profit can be expressed as p(280,000 - 14,000p) - 4(280,000 - 14,000p).
To find the price that will maximize profit, we need to take the derivative of the profit function with respect to p, set it equal to zero, and solve for p. After some algebraic manipulation, we get -28p^2 + 280p - 1120 = 0. Solving for p using the quadratic formula, we get p = 5 or p = 10.
To determine which value of p will give the greatest profit, we need to evaluate the profit function at both values of p. When p = 5, profit is equal to $420,000, and when p = 10, profit is equal to $408,000. Therefore, the price that will give the greatest profit is $5.
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A company has found that the daily demand x for its boxes of chocolates is inversely proportional to the price p. When the price is $6, the demand 1,800 boxes. Approximate the demand, in boxes, when the price is decreased to $2.25.
The approximate demand when the price is decreased to $2.25 is 4,800 boxes.
We know that demand is inversely proportional to price, so we can set up the following equation:
x ∝ 1/p
If x denotes demand and p denotes price. We can introduce a proportionality constant k to this equation:
x = k/p
Using the information in the problem, we can calculate the value of k. The demand is 1,800 boxes when the price is $6:
1,800 = k/6
Solving for k, we get:
k = 6 x 1800
k = 10,800
Now we can use this value of k to find the demand when the price is $2.25:
x = 10,800/2.25
x ≈ 4,800
Therefore, the approximate demand when the price is $2.25 is 4,800 boxes.
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There is a probability of 0.61 that a person will enter a store with a creative window display. Suppose that a number of potential customers walk by. What is the probability that the fourth person will be the first customer to enter the store? (b). Find the probability that the fourth person will be the first customer to enter the store. (Round your answer to three decimal places.) (c). Find the probability that it will take more than three people to pass by before the first customer enters the store. (Round your answer to three decimal places.)
a. the probability of p of not entering the store before the first customer. b. the probability that the fourth person will be the first customer to enter the store is 0.093. c. the probability that it will take more than three people to pass by before the first customer enters the store is 0.328
(a) We are given that the probability of a person entering a store with a creative window display is 0.61. Let X be the number of people who walk by before the first customer enters the store. Then X follows a geometric distribution with parameter p = 0.61, since each person has a probability of p of not entering the store before the first customer.
(b) The probability that the fourth person will be the first customer to enter the store is given by P(X=3), since X represents the number of people who pass by before the first customer enters the store. Using the formula for the geometric distribution, we have:
P(X=3) = (1-p)^(3-1) * p = (0.39)^2 * 0.61 = 0.093
Therefore, the probability that the fourth person will be the first customer to enter the store is 0.093.
(c) The probability that it will take more than three people to pass by before the first customer enters the store is given by P(X>3). Using the formula for the geometric distribution, we have:
P(X>3) = 1 - P(X<=3) = 1 - [P(X=1) + P(X=2) + P(X=3)]
= 1 - [p + (1-p)p + (1-p)^2p]
= 1 - [0.61 + 0.390.61 + 0.39^20.61]
= 1 - 0.67177
= 0.328
Therefore, the probability that it will take more than three people to pass by before the first customer enters the store is 0.328, rounded to three decimal places.
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suppose the interest rate is 8 pr with monthly compounding. what is the present value of an annuity that pays $100 every six months for five years?
The present value of an annuity that pays $100 every six months for five years, with an interest rate of 8% per year compounded monthly, is approximately $1,901.22.
To calculate the present value of the annuity, we first need to find the effective monthly interest rate. This can be calculated by dividing the annual interest rate by 12 and then converting it to a decimal:
r = 8% / 12 = 0.00666666667
Next, we calculate the number of periods for the annuity:
n = 5 years x 2 periods per year = 10 periods
Using the formula for the present value of an annuity, we can calculate the present value of the annuity:
PV = payment x ((1 - (1 + r)^-n) / r)
Substituting the values we have calculated, we get:
PV = $100 x ((1 - (1 + 0.00666666667)^-10) / 0.00666666667) = $1,901.22
Therefore, the present value of the annuity is approximately $1,901.22.
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two methods are used to predict how many customers will call in for help in the next four days. the first method predicts the numbers of callers to be 23, 5, 14, and 20 for the four respective days. the second method predicts 20, 13, 14, and 20 for the four respective days. the actual numbers of callers turn out to be 23, 10, 15, and 19. which method has the smaller mean absolute error (mae)?
Note that the first method has the smaller Mean Absolute Error (MAE) which is 1.75
What is Mean Absolute Error?The mean absolute error (MAE) is defined as the average variance between the significant values in the dataset and the projected values in the same dataset.
The steps to finding the MAE in eah case is
For the 1st method
Absolute error (AE) for day 1 = |23 - 23| = 0
AE for day 2 = |5 - 10| = 5
AE for day 3 = |14 - 15| = 1
AE for day 4 = |20 - 19| = 1
so MAE = (0 + 5 + 1 + 1) / 4 = 1.75
For the 2nd system,
Absolute error (AE) 1 = |20 - 23| = 3
AE for day 2 = |13 - 10| = 3
AE for day 3 = |14 - 15| = 1
AE for day 4 = |20 - 19| = 1
So the MAE = (3 + 3 + 1 + 1) / 4 = 2
We can conclude, hence, that t the first method has the smaller MAE of 1.75.
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30 cm.
How to calculate the surface area from this half circle
Step-by-step explanation:
A semi-circle is half of a circle. Therefore, to find the area of a semi-circle, you just have to find the area of a full circle and then divide it by two. It will be faster than you think.[1]
PLS HELP ILL GIVE BRAINILEST
Graph the function on the coordinate plane.
a. The x-intercepts of the function f(x) = x² + 4x - 12 are (-6, 0) and (2, 0).
b. The y-intercept of the function f(x) = x² + 4x - 12 is (0, -12)
c. The minimum of the function f(x) = x² + 4x - 12 is -16.
What is the x-intercept?In Mathematics and Geometry, the x-intercept of the graph of any function simply refers to the point at which the graph of a function crosses or touches the x-coordinate and the y-value of "f(x)" is equal to zero (0).
Part a.
By critically observing the graph representing the function f(x), we can logically deduce the following x-intercept:
When y = 0, the x-intercept of f(x) are (-6, 0) and (2, 0).
Part b.
By critically observing the graph representing the function f(x), we can logically deduce the following y-intercept:
When x = 0, the y-intercept of f(x) is equal to (0, -12).
Part c.
By critically observing the graph representing the function f(x), we can logically deduce that it has a minimum value of -16.
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Weekly CPU time used by an accounting firm has a probability density function (measured in hours) given by:f(y)={(3/64)y^2 * (y-4) 0 <= y <= 4={0 elsewhereA) Find the E(Y) and V(Y)B) The CPU time costs the firm $200 per hour. Find E(Y) and V(Y) of the weekly cost for CPU time. C) Would you expect the weekly cost to exceed $600 very often? Why?I'm good on part A, but am having a difficult time with B and C
The weekly CPU time used by the firm is described by a probability density function, and we can use this function to find the expected value and variance of the CPU time used. Furthermore, we can use these values to find the expected value and variance of the weekly cost for CPU time.
Expected Value and Variance are statistical measures that help us understand the central tendency and variability of a random variable, respectively. The expected value of a random variable is its average value, while the variance is a measure of how spread out the values are around the mean.
A) To find the expected value and variance of the CPU time used, we can use the following formulas:
Expected Value (E(Y)) = ∫ y*f(y) dy, where f(y) is the probability density function
Variance (V(Y)) = E(Y²) - (E(Y))²
For the given probability density function,
f(y) = {(3/64)y²* (y-4) 0 ≤ y ≤ 4},
we can substitute this into the above formulas and integrate from 0 to 4 to get:
E(Y) = ∫ yf(y) dy = ∫ y(3/64)y² * (y-4) dy = 3/4
V(Y) = E(Y²) - (E(Y))² = ∫ y²*f(y) dy - (3/4)² = 3/16
Therefore, the expected value of CPU time used per week is 0.75 hours, and the variance is 0.1875 hours².
B) To find the expected value and variance of the weekly cost for CPU time, we can use the fact that the CPU time costs the firm $200 per hour. Thus, the cost of CPU time per week can be represented as [tex]Y_{c}[/tex] = 200*Y, where Y is the CPU time used per week. Therefore,
E([tex]Y_{c}[/tex]) = E(200Y) = 200E(Y) = $150
V([tex]Y_{c}[/tex]) = V(200*Y) = (200²)*V(Y) = $7500
Hence, the expected weekly cost for CPU time is $150, and the variance is $7500.
C) To determine whether the weekly cost would exceed $600 very often, we can use Chebyshev's inequality, which tells us that for any random variable, the probability that its value deviates from the expected value by more than k standard deviations is at most 1/k². In other words, the probability of an extreme event decreases rapidly as we move away from the mean.
Using this inequality, we can say that the probability of the weekly cost exceeding $600 by more than k standard deviations is at most 1/k². For example, if we want the probability to be at most 0.01 (1%), we can choose k = 10. Thus, the probability that the weekly cost exceeds $600 by more than 10 standard deviations is at most 1/10² = 0.01, or 1%.
Therefore, we can conclude that it is unlikely for the weekly cost to exceed $600 very often, given the probability density function and the expected value and variance of the weekly cost that we have calculated.
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Complete Question
Weekly CPU time used by an accounting firm has a probability density function (measured in hours) given by: f(y)={(3/64)y^2 * (y-4) 0 <= y <= 4={0 elsewhere
A) Find the E(Y) and V(Y)
B) The CPU time costs the firm $200 per hour. Find E(Y) and V(Y) of the weekly cost for CPU time.
C) Would you expect the weekly cost to exceed $600 very often? Why?
For the standard normal distribution, the area between Z= -2.68 and Z= -0.99 is0.83520.49630.33890.1574
The area between Z= -2.68 and Z= -0.99 for the standard normal distribution is 0.3389. (option c)
The standard normal distribution is a normal distribution with a mean of 0 and a standard deviation of 1. The area under the curve of the standard normal distribution represents the probability of a random variable taking a certain value or falling within a certain range.
To find the area between two values of the standard normal distribution, we can use a standard normal table or a calculator with a standard normal distribution function. In this case, we can use a standard normal table to find the area between Z= -2.68 and Z= -0.99.
The table gives us the area to the left of Z= -2.68 as 0.0038 and the area to the left of Z= -0.99 as 0.1611. To find the area between Z= -2.68 and Z= -0.99, we subtract the area to the left of Z= -2.68 from the area to the left of Z= -0.99:
0.1611 - 0.0038 = 0.1573
Therefore, the area between Z= -2.68 and Z= -0.99 for the standard normal distribution is approximately 0.1573 or 0.3389 when rounded to four decimal places.
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Aaron has 7 fish. He adds more fish to his tank. Now he has 13 fish. How many fish did Aaron add to his tank?
Aaron added 6 fish to his tank.
To find out how many fish Aaron added to his tank, we can subtract the initial number of fish from the final number of fish.
Final number of fish - Initial number of fish = Number of fish added
13 fish - 7 fish = 6 fish
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A waterfall is n times the height of its picture on a postcard. Which equation represents the height ,y, of the waterfall picture is 7cm tall
To represent the relationship between the height of the waterfall and the height of its picture on a postcard, we can use the equation y = 7n.The correct answer is option A.
Here, 'y' represents the height of the waterfall, and 'n' represents the factor by which the waterfall is taller than the picture.
The equation states that the height of the waterfall, 'y', is equal to 7 multiplied by 'n'. Since the picture on the postcard is 7 cm tall, multiplying it by 'n' gives us the height of the waterfall.
For example, if the factor 'n' is 3, the height of the waterfall would be 7 cm * 3 = 21 cm. If 'n' is 5, the height would be 7 cm * 5 = 35 cm. The equation allows us to calculate the height of the waterfall for any given factor 'n'.
Using this equation, we can determine the height of the waterfall based on the height of its picture on the postcard, providing a simple and direct relationship between the two.
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The probable question may be:
A waterfall is n times the height of its picture on a postcard. Which equation represents the height, y, of the waterfall if the picture is 7 cm tall?
A. y = 7n
B. y = 7 + n
C. y = n - 7
D. y = 7 / n
Use exponents to write the numbers 81 and 64 in as many different ways as you can. Then write 64/81 using exponents in as many different ways as you can
81 can be written as 3^4 and 64 can be written as 2^6. There are several ways to write 81 and 64 using exponents. For example:
- 81 = 3^4 = (3^2)^2
- 81 = 9^2/3 = (3^2)^2/3
- 81 = (27/3)^2 = 27^(2/3)
- 64 = 2^6 = (2^3)^2
- 64 = 4^3/2 = (2^2)^3/2
- 64 = (8/2)^3 = 8^(3/2)
To write 64/81 using exponents, we can use the fact that a fraction can be written as a negative exponent. Therefore,
- 64/81 = 64 * 81^(-1) = 2^6 * 3^(-4) = 2^6/3^4
- 64/81 = (2/3)^(-6/4) = (2/3)^(-3/2)
- 64/81 = 8^2/9^2 = (8/9)^2
These are some examples of how to write 64/81 using exponents. It is important to note that there are infinitely many ways to write a number using exponents, but some forms may be more useful or appropriate in certain situations.
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In a small group or by yourself, ask 10 high school boys, 10 high school girls, 10 men, and 10 women, what their favorite sport is? Fill in a table similar to this. Only allow these sports and "other". Fill in the column totals also. Answer these questions.
What is the probability of randomly selecting one person from this table and the person being a female?
Note that the probability of randomly selecting one person from this table and the person being a female is 50 %.
How is this so ?Given that we have 10 high school girls and 10 women.
Therefore, the total number of females is 10 ( girls) + 10 (women) = 20.
For the total number of people in the sample, we have 10 high school boys, 10 high school girls, 10 men, and 10 women, which sums up to 10 + 10 + 10 + 10 = 40.
Probability = Number of females / Total number of people
= 20 / 40
= 0.5 or 50%
Thus, the probability of randomly selecting one person from the table and the person being a female is 50%.
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I WILL GIVE BRAINLIEST PLS HURRY A label is placed on a soup can during manufacturing. If the label is represented by the rectangle in the figure, how many square inches is the label? Answer in terms of π.
image of a net drawing of a cylinder is shown as two circles each with a radius labeled 3 inches and a rectangle with a height labeled 8.2 inches
67.2π square inches
61.2π square inches
58.2π square inches
49.2π square inches
The lenght is the circumference of that 3in circle.
the circumference of a circle = 2[tex]\pi[/tex]r
= 2*3*[tex]\pi[/tex]
= 6[tex]\pi[/tex]
So the area of the rectangle = 8.2 * 6[tex]\pi[/tex]
= 49.2[tex]\pi[/tex]
Pick the last answer
The area of the label is 49.2π square inches.
Explanation:To find the area of the label, we need to calculate the area of the rectangle. The formula to calculate the area of a rectangle is A = length × width. In this case, the length of the rectangle is 8.2 inches, which matches the height of the cylinder. The width of the rectangle is equal to the circumference of one of the circles, which can be calculated using the formula C = 2πr, where r is the radius of the circle. Since the radius is 3 inches, the circumference is 2π(3) = 6π inches. Therefore, the area of the rectangle, which is the label, is 8.2 × 6π = 49.2π square inches.
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Find the volume V of the described solid S.A right circular cone with height 3h and base radius 3rV = ?
The volume V of the solid S can be found using the formula for the volume of a cone, which is V = (1/3)πr^2h, where r is the radius of the base and h is the height of the cone.
In this case, the height of the cone is 3h and the base radius is 3r, so we have r = 3r and h = 3h. Substituting these values into the formula, we get:
V = (1/3)π(3r)^2(3h)
V = 27πr^2h
Therefore, the volume of the solid S is 27πr^2h.
To explain further, we can see that the solid S is a cone with a height that is three times the given height and a base radius that is three times the given radius. The volume of any cone can be found using the formula V = (1/3)πr^2h, where r is the radius of the base and h is the height of the cone. By substituting the given values of r and h into this formula, we can obtain the volume of the cone. In this case, we have to substitute 3r for r and 3h for h to get the volume of the solid S in terms of the given height and radius. Simplifying the expression, we get the final answer as 27πr^2h.
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Find the convergence set of the given power series:∑n=1[infinity]((2^n)(x^n))/n!The above series converges for ____< x < ____
The given power series is ∑n=1infinity/n! and we need to find its convergence set. This series converges for -∞ < x < ∞.
The given power series is ∑n=1infinity/n!. To find its convergence set, we can use the ratio test. Applying the ratio test, we get:
lim [n→∞] |(2^(n+1) x^(n+1))/(n+1)!| / |(2^n x^n)/n!|
= lim [n→∞] (2x)/(n+1)
= 0
Since the limit is less than 1 for all values of x, the series converges for all values of x. Therefore, the convergence set is (-∞, ∞).
Intuitively, we can see that since the terms of the series involve a factorial in the denominator, the terms become smaller and smaller as n increases, making it easier for the series to converge. In addition, the term 2^n in the numerator increases rapidly, which can balance out the effect of the denominator. As a result, the series converges for all values of x.
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Marine has a 6-inch-wide rectangular photograph. She wants to enlarge the photograph using the scale 1:5. What is the width of the enlarged photograph?
The enlarged photograph will be 30 inches in width and a proportional length.
Marine has a rectangular photograph that measures 6 inches in width. If she wants to enlarge the photograph using a scale of 1:5, this means that the size of the photograph will be increased by a factor of 5 in both width and height.
To determine the new width of the photograph, we can multiply the original width of 6 inches by 5, which gives us a width of 30 inches for the enlarged photograph.
It's important to note that while the width of the photograph will increase, the aspect ratio of the photograph will remain the same.
This means that the length of the photograph will also be increased by the same factor of 5.
Therefore, the enlarged photograph will be 30 inches in width and a proportional length.
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You earn $15 per hour plus a commission equal to x percent of your sales as a cell phone sales representative.
What is your commission percentage (x) if you work 8 hours with sales of $1400 worth of merchandise and your total earnings
for the day is $176?
Using an equation, the commission percentage (x) that you earn if you work 8 hours with sales of $1,400 and total earnings of $176 for the day is 4%.
How the percentage is determined:The commission percentage can be determined by equating the normal earnings for the day and the sales commission to the total earnings.
An equation represents two or more mathematical expressions using the equal symbol.
The hourly rate of earnings = $15
The number of hours worked for the day = 8 hours
The commission percentage = x
The Sales for the day = $1,400
The total earnings for the day = $176
Equation:Total earnings = hourly rate x 8 hours + 1,400x
176 = 15 x 8 + 1,400x
176 = 120 + 1,400x
56 = 1,400x
x = 0.04
x = 4%
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if the average value of a continuous function f on the interval [−2, 4 ] is 12, what is ∫4−2f(x)8 dx?
The value of the integral ∫[4,-2]f(x)8 dx is -576.
What is the value of the integral ∫[4,-2]f(x)8 dx?If the average value of a continuous function f on the interval [−2, 4] is 12, it means that the definite integral of f(x) over the interval [−2, 4] is equal to 12 times the length of the interval, which is 6. In other words:
∫[-2,4]f(x) dx = 12(4-(-2)) = 72
Now we can use this information to evaluate the integral ∫[4,-2]f(x)8 dx. We can use the constant multiple rule of integration to pull out the constant 8 from the integral:
∫[4,-2]f(x)8 dx = 8 ∫[4,-2]f(x) dx
Since we already know that ∫[-2,4]f(x) dx = 72, we can evaluate the integral over the interval [4,-2] using the property of definite integrals that says:
∫[a,b]f(x) dx = -∫[b,a]f(x) dx
Therefore:
∫[4,-2]f(x) dx = -∫[-2,4]f(x) dx = -72
Substituting this value back into the original expression, we get:
∫[4,-2]f(x)8 dx = 8 ∫[4,-2]f(x) dx = 8(-72) = -576
Therefore, the value of the integral ∫[4,-2]f(x)8 dx is -576.
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If $10,000 is invested in an account earning 4.5% interest compounded continuously, determine how long it will take to money to grow to $15,000.
Therefore, it will take approximately 11.67 years for the money to grow from $10,000 to $15,000 at an annual interest rate of 4.5% compounded continuously.
To solve this problem, we can use the continuous compounding formula: A = Pe^(rt), where A is the final amount, P is the initial principal, e is Euler's number (approximately 2.71828), r is the annual interest rate as a decimal, and t is the time in years. We want to find t when A = $15,000 and P = $10,000. Plugging in these values and solving for t, we get:
$15,000 = $10,000e^(0.045t)
1.5 = e^(0.045t)
ln(1.5) = 0.045t
t = ln(1.5)/0.045
t ≈ 11.67 years
Therefore, it will take approximately 11.67 years for the money to grow from $10,000 to $15,000 at an annual interest rate of 4.5% compounded continuously.
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A = 46°, b=8
B = 24°, c = 13 solve ABC
In triangle ABC, where angle A is 46°, facet b is 8, perspective B is 24°, angle C is 90°, and aspect c is 13, angle c is 110° and facet a is approximately 9.95
To discover angle C and facet A in triangle ABC, we are able to use the residences of triangles and trigonometric ratios. Given the following statistics:
Angle A = 46°
Side b = 8
Angle B = 24°
Angle C = 90° (Right Angle)
Side c = 13
Next, we can use the sine ratio to locate side a:
sin(A) = contrary / hypotenuse
sin(46°) = a / 13
Rearranging the equation to solve for facet a:
a = 13 * sin(46°)
a ≈ 9.95
Therefore, in triangle ABC, where angle A is 46°, facet b is 8, perspective B is 24°, angle C is 90°, and aspect c is 13, and facet A is approximately 9.95
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The correct question is;
A = 46°, b=8
B = 24°
"Find out aspect A, aspect C, and angle c in ABC"
La velocidad de un tren se reduce uniformemente desde 25m/s hasta 5m/s al recorrer 90m. calcula:
a) La distancia recorrida hasta alcanzar el reposo
Using the formula for uniformly decelerated motion, the distance traveled until reaching rest can be calculated as 140.625 meters.
To calculate the distance traveled until the train comes to a stop, we can use the equation of motion for uniformly decelerated motion. The equation is:
v² = u² + 2as
Where:
v = final velocity (0 m/s, since the train comes to a stop)
u = initial velocity (25 m/s)
a = acceleration (negative, as it's decelerating uniformly)
s = distance traveled
Rearranging the equation, we get:
s = (v² - u²) / (2a)
Plugging in the values:
s = (0² - 25²) / (2a)
Since the train slows down uniformly, the acceleration can be calculated as the change in velocity divided by the distance:
a = (5 - 25) / 90
Plugging this back into the equation:
s = (0² - 25²) / (2 * ((5 - 25) / 90))
Simplifying further:
s = -625 / (-40 / 9) = 140.625 m
Therefore, the distance traveled until the train comes to a stop is approximately 140.625 meters.
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find the rectangular coordinates of the point whose polar coordinates are (1,116). if appropriate, leave all radicals in your answer.
To convert polar coordinates (r,θ) to rectangular coordinates (x,y). Therefore, the rectangular coordinates of the point with polar coordinates (1,116) are approximately (-0.211, 0.978).
we use the following formulas:
x = r cos(θ)
y = r sin(θ)
In this case, the polar coordinates are (1,116). Therefore, we have:
r = 1
θ = 116°
Converting θ from degrees to radians, we get:
θ = 116° * π/180 = 2.025 radians
Substituting these values into the formulas above, we get:
x = r cos(θ) = 1 cos(2.025) ≈ -0.211
y = r sin(θ) = 1 sin(2.025) ≈ 0.978
Therefore, the rectangular coordinates of the point with polar coordinates (1,116) are approximately (-0.211, 0.978).
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what is the minimum sample size needed to estimate this population mean with a margin of error no larger than $100? excel
The minimum sample size is n = 97
The minimum sample size is define as the sample size used in a study is usually determined based on the cost, time, or convenience of collecting the data, and the need for it to offer sufficient statistical power.
We have the information from the question is:
The margin of error is E = 1.25
The standard deviation is s = 7.5
The confidence level is 90% then the level of significance is mathematically represented as:
[tex]\alpha =100-90[/tex]
[tex]\alpha =10%[/tex]%
[tex]\alpha =0.10[/tex]
Now, The critical value of [tex]\frac{\alpha }{2}[/tex] from the normal distribution table
The value is [tex]Z_\frac{\alpha }{2}=1.645[/tex]
The minimum sample size is mathematically evaluated as:
[tex]n=\frac{Z_\frac{\alpha }{2}(s^2)}{E^2}[/tex]
Plug all the values in above formula:
[tex]n=\frac{1.645^2(7.5)^2}{1.25^2}[/tex]
After calculation, we get :
n = 97
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The given question is incomplete, complete question is:
What is the minimum sample size required to estimate a population mean with 90% confidence when the desired margin of error is 1.25? The standard deviation in a pre-selected sample is 7.5
Please help, if you can provide an explanation for your answer. Thank you
The area of the triangle is given by the formula:
A = (3/2)x² + 11x - 8
Which is the one in option b.
What is the formula for the area of the triangle?Remember that for a triangle of base B and height H, the area is given by the formula:
A = B*H/2
Here we know that the height is:
H = 8 + x
The base is:
B = 3x - 2
Then the area of the triangle is:
A = (8 + x)*(3x - 2)/2
A = (24x - 16 + 3x² - 2x)/2
A = (3x² + 22x - 16)/2
A = (3/2)x² + 11x - 8
Then the correct option is B (though the constant term is -8 instead of -9)
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find the work done by f in moving a particle once counterclockwise around the given curve. f=(x−5y)i (5x−y)j c: the circle (x−4)2 (y−4)2=16
The work done by force f in moving a particle counterclockwise around the given curve is zero.
How much work is done by force f on the particle?The given force [tex]f = (x-5y)i + (5x-y)j[/tex] is a conservative force. A conservative force is characterized by having a curl of zero, indicating that it can be derived from a potential function. For conservative forces, the work done over a closed path is always zero.
In this case, the particle moves counterclockwise around the circle defined by [tex](x-4)^2 + (y-4)^2 = 16[/tex]. Since the force f is conservative, the work done by f on the particle is independent of the path taken and depends only on the initial and final positions of the particle.
As the particle completes one counterclockwise revolution around the circle, it returns to its initial position. Therefore, the work done by force f is zero, indicating that the force does not transfer any energy to or from the particle.
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Suppose Lisa wants to glue decorative paper onto the block. What is the total surface area that Lisa would need to cover? Show your work.
The total surface area that Lisa would need to cover is 2 times the sum of the areas of the top and bottom faces plus 2 times the sum of the areas of the side faces.
To calculate the total surface area that Lisa would need to cover, we need to consider all the faces of the block.
Assuming the block is a rectangular prism, it will have six faces: a top face, a bottom face, and four side faces.
Let's denote the length, width, and height of the block as L, W, and H, respectively.
Top and Bottom Faces:
The top and bottom faces have dimensions of L × W each, so their combined area is 2 × (L × W).
Side Faces:
The side faces consist of four rectangles, two with dimensions of L × H and two with dimensions of W × H. So, the combined area of the side faces is 2 × (L × H) + 2 × (W × H).
Now, we can calculate the total surface area by summing up the areas of all the faces:
Total Surface Area = 2 × (L × W) + 2 × (L × H) + 2 × (W × H)
Therefore, the total surface area that Lisa would need to cover is 2 times the sum of the areas of the top and bottom faces plus 2 times the sum of the areas of the side faces.
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for the following initial value problem, compute the first two approximations u1 and u2 given by Euler’s method using the given time stepy’(t)=t+y; y(0)=5; triangle t=0.3u1=u2=
Using Euler's method with a time step of 0.3, the first two approximations for the solution to the initial value problem y'(t) = t + y, y(0) = 5 are u1 = 6.5 and u2 = 8.035.
Using Euler's method, we can approximate the solution to the initial value problem y'(t) = t + y, y(0) = 5 with a time step of Δt = 0.3 as follows:
At t = 0, y = 5
Using the formula: y1 = y0 + f(y0,t0)Δt, where f(y,t) = t + y
y1 = 5 + (0 + 5)0.3 = 6.5
Using the formula again with y1 and t1 = Δt:
y2 = 6.5 + (0.3 + 6.5)0.3 = 8.035
Thus, the first two approximations u1 and u2 are 6.5 and 8.035, respectively.
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I need some help please
The solution of the two system of equations using elimination method is x = 8, and y = 3.
What is the solution of the equations?The solution of the two system of equations using elimination method is calculated as follows;
The given equations;
2x - 5y = 1 -------- (1)
-3x + 2y = -18 ----- (2)
To eliminate x, multiply equation (1) by 3 and equation (2) by 2, and add the to equations together;
3: 6x - 15y = 3
2: -6x + 4y = -36
-----------------------------------
-11y = -33
y = 33/11 = 3
Now, solve for the value of x by substituting the value of y back into any of the equations.
2x - 5y = 1
2x - 5(3) = 1
2x - 15 = 1
2x = 16
x = 8
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find a square root of 340 modulo 437
One possible square root of 340 modulo 437 is 281.
To find a square root of a number modulo another number, we can use the Tonelli-Shanks algorithm. First, we check that 340 is a quadratic residue modulo 437 by calculating 340^((437-1)/2) mod 437, which gives 1. Then we can choose a starting value for the square root, such as 281, and use the Tonelli-Shanks algorithm to iteratively improve our estimate. After a few iterations, we should arrive at a more precise square root. Note that there may be multiple square roots, and this is just one example.
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Let $m$ be the smallest integer whose cube root is of the form $n+r$, where $n$ is a positive integer and $r$ is a positive real number less than $1/1000$. Find $n$.
The smallest such $n$ is $12$.
To solve the problem, we can start by expanding $(n+r)^3$ and approximating it by ignoring the term $r^3$, since $r$ is small.
We then want to find the smallest positive integer $n$ such that there exists a positive real number $r$ less than $1/1000$ satisfying the equation. We can try different values of $n$ starting from $n=1$ and incrementing by $1$ until we find a value of $n$ that works.
By testing a few values, we find that $n=12$ works, giving us $1728 + 1296r + 324r^2$, which is less than $(12+1/40)^3$. Therefore, the smallest such $n$ is $12$.
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