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 $S(d) =30.8+1.5 \log (d+1)$ , where $S$ is measured in grams salt per kilogram water and $d$ is measured in meters. What is the salinity when the depth is $557 \mathrm{~m}$ ? Round your answer to the nearest hundredth.

A) $-26.68 \mathrm{~g}$ salt $/ \mathrm{kg}$ water
B) $34.92 \mathrm{~g}$ salt $/ \mathrm{kg}$ water
C) $83.10 \mathrm{~g}$ salt $/ \mathrm{kg}$ water
D) $86.10 \mathrm{~g}$ salt $/ \mathrm{kg}$ water