Find the expected value, the variance, and the standard deviation, when they exist, for the probability density function. Give an exact answer for the expected value and round the variance and standard deviation to four decimal places when appropriate.f(x) = 
A. 
; does not exist; does not exist
B. 
; 2.2168; does not exist
C. 
; 1.4889; does not exist
D. 
; 2.2168; 1.4889
Answer: A
Mathematics
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- cos 
A. -2
B. -2
C. -2
D. -2
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Write interval notation for the following. Then graph the interval on a number line.{x?-3 ? x ? 1}
A. (-3, 1)
B. [-3, 1]
C. (-3, 1]
D. [-3, 1)
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Find the indicated roots.Cube roots of 8i
A. -2i, 
+ i, - 
+ i
B. -2i, - 
- i, 
- i
C. 2i, 
+ i, - 
+ i
D. 2i, 
- i, - 
- i
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Find (g ? f)(–3).
 figure 1.png)
A) 4 B) 5 C) 6 D) Undefined
Mathematics