Solve the Problem $f ( x ) = 28.4 + 1.3 \log ( x + 1 )$

question 77

Multiple Choice

Solve the problem.
-Suppose $f ( x ) = 28.4 + 1.3 \log ( x + 1 )$ models salinity of ocean water to depths of 1000 meters 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 29 .

• A) \(1.9 \mathrm {~m}\)
• B) \(- 0.9 \mathrm {~m}\)
• C) \(- 0.7 \mathrm {~m}\)
• D) \(3.9 \mathrm {~m}\)