Find the area or volume.Find the volume of the solid generated by revolving the area under y = 8e-x in the first quadrant about the y-axis.
A. 1
B. 32?
C. 16?
D. 8?
Answer: C
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Use spherical coordinates to find the volume of the indicated region.the region that lies inside the sphere 
and outside the cylinder 
A. 
B. 
C. 
D. 
Use the frequency polygon to answer the following.The frequency polygon shows the salaries of employees of a small company.
The greatest number of employees are in which salary group?
A. $50,000-$60,000 B. $30,000-$35,000 C. $50,000-$55,000
Use properties of logarithms to condense the logarithmic expression. Write the expression as a single logarithm whose coefficient is 1. Where possible, evaluate logarithmic expressions.
(log4 x + log4 y) - 2 log4 (x + 3)
A. log4 
B. log4 
C. log4 
D. log4 
Solve the system by substitution.0.7x + 0.5y = -1.7 x - 0.8y = 0.6
A. {(-0.1, -0.2)} B. ? C. {(-2, -1)} D. {(-1, -2)}