Chapter 6.1, Problem 33PE

A sewer line must have a minimum slope of $0.25\text{ in}\text{.}$ per horizontal foot but not more than $3\text{ in}\text{.}$ per horizontal foot. A slope less than $0.25\text{ in}\text{.}$ per foot will cause drain clogs, and a slope of more than $3\text{ in}\text{.}$ per foot will allow water to drain without the solids.

a. To the nearest tenth of a degree, find the angle of depression for the minimum slope of a sewer line.

b. Find the angle of depression for the maximum slope of a sewer line. Round to the nearest tenth of a degree.