Basic College Mathematics (9th Edition)

Published by Pearson
ISBN 10: 0321825535
ISBN 13: 978-0-32182-553-7

Chapter 7 - Measurement - 7.1 Problem Solving with U.S. Measurement Units - 7.1 Exercises: 37

Answer

4 inches to 8 inches

Work Step by Step

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
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