Find the expected value and variance for the random variable whose probability density function is   (You may use the fact that beb = 0 .)Enter just two integers (unlabeled) in the order E(X), Var(X) separated by a comma.

Fill in the blank(s) with the appropriate word(s).


-1, 1

Mathematics

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Compute the value of the given expression.- - 

A. 2 B. 18 C. -18 D. -2

Mathematics

Solve.The time T necessary to make an enlargement of a photo negative is directly proportional to the area A of the enlargement. If 24 seconds are required to make a 3-by-4 enlargement, find the time required for a 4-by-9 enlargement.

A. 144 sec B. 36 sec C. 72 sec D. 108 sec

Mathematics

Solve the inequality, then graph the solution.-10x ? 20

A. (-?2]

B. [-2?)

C. (-?-2]

D. [2?)

Mathematics

Solve the equation. - x +  = x - 10

A. -3 B. -7 C. 7 D. 21

Mathematics