04/21/19

The expected value of the sum of two random variables E(X + Y) = E(X) + E(Y). Why is the average of the sum of two sets of data not equal to the sum of the averages. avg(X + Y) != avg(X) + avg(Y)
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04/21/19

. find the minimum number of units that can be produced and sold to avoid loss
R=400+25x- x2, C=50+50x.
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04/21/19

Normala distribution

The average woman height is 65 inches with a standard deviation of 3.5 inches. What proportion of women are shorter than 62 inches tall.
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04/21/19

Janie’s Total trip to and from school is 0.46 of a mile. How far did she walk if she makes this trip 19 days last quarter?
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04/20/19

Estimate the area under the graph of 𝑓 ( 𝑥) = 𝑥^2 + 5 between 𝑥 = −2 and 𝑥 = 1 using 3 rectangles and
Estimate the area under the graph of 𝑓 ( 𝑥) = 𝑥^2 + 5 between 𝑥 = −2 and 𝑥 = 1 using 3 rectangles and a. Right endpoints b. Left endpoints c. Midpoints
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04/20/19

Calculus Question
A 10 m ladder leans against a vertical wall and the bottom of the ladder slides away from the wall at a rate of 0.6m/sec. (a)  How fast is the top of the ladder sliding down the wall when the... more
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04/20/19

How do I find the final mixture required and percent of acid in final mixture required and the amount of 25% and 50% of the solution in liters?

Find how much of each solution is required to obtain 25% solution and 50% solution and find the amount of final mixture required and percent of acid in final mixture required
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04/20/19

How many units must the company sell to break even; how many units to make profit of $100,000?
A small software development company invests $15,000 to produce a software package that will sell for $51.55. each unit costs $10.25 to produce.Find how many units the company needs to sell to... more
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04/20/19

How do I solve this problem?
Two planes start from Los Angeles International Airport and fly in opposite directions. The second plane starts 1/2 hour after the first plane, but it's speed is 40 kilometers per hour faster. Find... more
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04/20/19

How do I solve for x and y?
Solve the 3x3 matrix for x and yx+2 8 -3. = 2x+6 8 -37 10 -8. 7 10 -87 -2 y+2. 7 -2 x
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04/20/19

More about equation
Sam runs from town A to town B which are 20km apart. It is given that Sam runs with a constant speed in the first 12km,then his speed decreases by 5km/h in the last 8km. If the total time spent by... more
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04/20/19

A point​ P(x,y) is shown on the unit circle corresponding to a real number t. Find the values of the trigonometric functions at t.
A point​ P(x,y) is shown on the unit circle corresponding to a real number t. Find the values of the trigonometric functions: sin t, cos t, tan t, csc t, sec t, and cot t.P ( - sqrt3/2, - 1/2)
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04/20/19

For the function ƒ(x) = 4x − 3, evaluate and simplify the expression:
  a. b. c.   d.
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C

04/20/19

C default arguments?
Is there a way to specify default arguments to a function in C?
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04/19/19

Dont understand.

Sarah has 4 feet of ribbon ,it must be cut in 7 equal lenghts. How long will each piece of ribbon be after she cuts it. Was told there can be no remainder.
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04/19/19

A Web music store offers two versions of a popular song. The size of the standard version is 2.3 megabytes (MB)...
A Web music store offers two versions of a popular song. The size of the standard version is 2.3 megabytes (MB). The size of the high-quality version is 4.3 MB. Yesterday, the high-quality version... more
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04/18/19

B) Find the dimensions of the rectangle with perimeter 64 inches that has maximum area, and then find the maximum area.
L=_____, W=_____, Maximum area=____
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04/18/19

A) Find the dimensions of the rectangle with area 324 square inches that has minimum perimeter, and then find the minimum perimeter.

L=_____, W=18, Minimum Perimeter= 72
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04/18/19

Suppose that f(x)=x^4+8x^3
b.) Find all intercepts. x-intercept(s)=____ y-intercept(s)= 0c.) Find all critical values of f. Critical value(s)=_______d.) Use interval notation to indicate where f(x) is increasing or... more
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04/18/19

Suppose that f(x)=((7x-6)/(x+5))
d.) Use interval notation to indicate where f(x) is increasing or decreasing. Increasing: Decreasing: empty set
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04/18/19

ite an expression that represents the cost in dollars of buying any number of hats h in any number of shirts s. the find the cost of buying 4 hats and 3 shirts.
What do we know?What do we want to find out?Solve.
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04/18/19

In mathematics class you have taken five tests and your average test grade is 91%. On the next test your grade is 78%. What is your new test average?

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04/18/19

Find all vertical, horizontal, and slant asymptotes of the graph of the function.
Find all vertical, horizontal, and slant asymptotes of the graph of the function.f(x) = x³/2x²-50
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04/18/19

Precalculus word problem
Construct a polynomial function with the following properties: fifth degree, 3 is a zero of multiplicity 3, -4 is the only other zero, leading coefficient is 4 
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04/18/19

Find a power series representation of f.

Find a power series representation of f. Use a geometric series and properties of a power series. (Assume that −1 ≤ x ≤ 1.)f(x) = 8 ln(1 + x4)
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