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. 
; 9.1563; does not exist
B. 
; 83.8385; 9.1563
C. 
; does not exist; does not exist
D. 
; 83.8385; does not exist
Answer: C
Mathematics
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Simplify.(4x2 - xy - y2) + (x2 + 9xy + 11y2)
A. 5x2 + 8xy + 10y2 B. 3x2 - 10xy - 12y2 C. 5x2 + 10xy + 12y2 D. 4x2 + 9xy + 11y2
Mathematics
In the circuit below, find fCO and VO if Vin = 42 V, R = 22 K, and C = 0.00015 æF.
a. VO = 29.7 V, fCO = 48.2 KHz
b. VO = 21.0 V, fCO = 48.2 KHz
c. VO = 21.0 V, fCO = 31.7 KHz
d. VO = 29.7 V, fCO = 31.7 KHz
e. VO = 21.0 V, fCO = 34.1 KHz
Mathematics
Find the principal square root of the number. Approximate the answer to the nearest hundredth whenever appropriate.y2, y > 0
A. y4 B. -y, y C. y D. -y
Mathematics
Sketch the graph of the function 
on 
using the curve-sketching guidelines.
What will be an ideal response?
Mathematics