Suppose That the Salinity $S$ Of Ocean Water at a Given Depth

Multiple Choice

Suppose that the salinity $S$ of ocean water at a given depth $d$ is modeled by the equation $\mathrm { S } ( \mathrm { d } ) = 31.7 + 1.5 \log ( \mathrm { d } + 1 )$ , where $\mathrm { S }$ is measured in grams salt per kilogram water and $\mathrm { d }$ is measured in meters. What is the salinity when the depth is $931 \mathrm {~m}$ ? Round your answer to the nearest hundredth.

A) $- 27.25 \mathrm {~g} \mathrm { salt } / \mathrm { kg }$ water
B) $92.63 \mathrm {~g} \mathrm { salt } / \mathrm { kg }$ water
C) $95.63 \mathrm {~g} \mathrm { salt } / \mathrm { kg }$ water
D) $36.15 \mathrm {~g} \mathrm { salt } / \mathrm { kg }$ water