Solve the problem.Suppose f(x) = 33.1 + 1.2log (x + 1) models salinity of ocean water to depths of 
at a certain latitude. x is the depth in meters and f(x) is in grams of salt per kilogram of seawater. Approximate the depth (to the nearest tenth of a meter) where the salinity equals 35.
A. -0.9 m
B. 39.3 m
C. -1.0 m
D. 37.3 m
Answer: D
Mathematics
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Find the volume of the solid generated by revolving the region R bounded by the graphs of the given equations about the y-axis.x = 
, x = 0, between y = 1 and y = 6
A. 
?
B. 
?
C. 
?
D. 
?
Mathematics
Perform the indicated operation. Assume that all variables are nonnegative.(
+ 4)(
- 4)
A. -6
B. 26
C. 6
D. 10 - 2
Mathematics
Convert the equation given in polar form into rectangular form.r = -4 cos ?
A. x2 + y2 = 4
B. x = -4
C. 
2 + y2 = 16
D. 
2 + y2 = 4
Mathematics
Find the amount of each payment needed to accumulate the indicated amount in a sinking fund. Round to the nearest cent.
$6,700, money earns 5% compounded annually, 8 years
A. $822.89 B. $676.97 C. $727.15 D. $701.62
Mathematics