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