Solve the problem.Suppose f(x) = 33.4 + 1.3log (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 salinity (to the nearest hundredth) when the depth is 40 meters.
A. 52.57 grams of salt per kilogram of seawater
B. 31.30 grams of salt per kilogram of seawater
C. 55.17 grams of salt per kilogram of seawater
D. 35.50 grams of salt per kilogram of seawater
Answer: D
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Solve the problem.The intensity of a radio signal from the radio station varies inversely as the square of the distance from the station. Suppose the the intensity is 8000 units at a distance of 2 miles. What will the intensity be at a distance of 3 miles? Round your answer to the nearest unit.
A. 3582 units B. 3520 units C. 3539 units D. 3556 units
Evaluate the expression.815/4
A. 243 B. 2187 C. 19,683 D. 6561
Simplify the given expression. Write the answer with variables in alphabetical order and any constant term last.11s + 12t + 15s
A. 
s + 12t
B. 26s2 + 12t
C. 26s + 12t
D. 23t + 15s
Determine whether the given function satisfies a Laplace equation.f(x, y, z) = 10x2 - 4y2 - 6z2
A. Yes B. No