## Basic College Mathematics (10th Edition)

Given, after 15 years, a saguaro cactus is still only $\frac{1}{3}$ ft to $\frac{2}{3}$ ft of a foot tall, depending upon rainfall. To find how tall could the cactus be in inches, Use a unit fraction with inches (the unit for your answer) in the numerator, and foot (the unit being changed) in the denominator. Because 12 inches (in.) = 1 foot (ft.), the necessary unit fraction is $\frac{12 inches}{1 foot}$ Multiply $\frac{1}{3}$ ft times the unit fraction. $\frac{1}{3}$ ft * $\frac{12 inches}{1 foot}$ = 4 inches Multiply $\frac{2}{3}$ ft times the unit fraction. $\frac{2}{3}$ ft * $\frac{12 inches}{1 foot}$ = 8 inches Therefore the cactus is 4 inches to 8 inches tall