A PDF for a continuous random variable X is given. Use the PDF to find E(X).f(x) = 
A. 5
B. 
C. 
D. 
Answer: B
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Decide whether or not the given equation is an identity.
- 
= csc ?t - sin ?t
A. Yes B. No
Find the equation of a line passing through the given points. Solve the equation for y.(-6, -51) and (3, 12)
A. y = 7x - 9
B. y = 
x - 
C. y = - 
x - 
D. y = -7x - 93
Solve the problem.From a 36-inch by 36-inch piece of metal, squares are cut out of the four corners so that the sides can then be folded up to make a box. Let x represent the length of the sides of the squares, in inches, that are cut out. Express the volume of the box as a function of x.
A. V(x) = 4x3 - 144x2 B. V(x) = 4x3 - 144x2 + 1,296x C. V(x) = 2x3 - 108x2 D. V(x) = 2x3 - 108x2 + 36x
Solve the problem.A salesperson gets a commission of $1400 for the first $10,000 of sales, and then $700 for each additional $10,000 or partial of sales. Let S(x) represent the commission on x dollars of sales. Find the value of 
A. $7000 B. $6650 C. $5950 D. $7350