Solve the problem.The annual rainfall in Maine is a random variable with probability density function defined by
for x in 
Find the probability of rainfall greater than one standard deviation above the mean.
A. 0.346
B. 0.086
C. 0.159
D. 0.188
Answer: D
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Find the surface area or volume.Use an integral table and a calculator to find to two decimal places the area of the surface generated by revolving the curve 
about the x-axis.
A. 69.72 B. 40.67 C. 81.33 D. 57.04
If 
find 
and 
a. 
(x) = –6 cos(2x)+ 2cos(x)
b. 
(x) = –6sin(x) + sin(2x)
c. (x) = –6sin(2x) + sin(x)
d. (x) = –6 cos(x)+ 2cos(2x)
e. (x) = –2 cos(2x)+ 6cos(x)
Simplify.
A. 
B. - 
C. - 
D. - 
Solve the problem.The average value of a certain type of automobile was $14,700 in 1992 and depreciated to $4140 in 1997. Let y be the average value of the automobile in the year x, where x = 0 represents 1992. Write a linear equation that models the value of the automobile in terms of the year x.
A. y = -2112x + 4140
B. y = -2112x - 6420
C. y = -2112x + 14,700
D. y = - 
x - 4140