Simplify the Rational Expression

Multiple Choice

Simplify the rational expression. Use factoring, and assume all variable expressions represent positive real numbers.
-The algebraic expression 0.07d3/2 describes the duration of a storm, in hours, whose diameter is d miles. Use a calculator to determine the duration of a storm with a diameter of 10 miles. Round to the nearest hundredth.

A) 31.62 hr
B) 0.59 hr
C) 2.21 hr
D) 0.22 hr