Algebra 1

Published by Prentice Hall
ISBN 10: 0133500403
ISBN 13: 978-0-13350-040-0

Entry Level Assessment - Multiple Choice - Page XXXVI: 21


A) 32 ft

Work Step by Step

This is a proportion problem. You already know that a 6-feet tall object creates a 9-feet tall shadow. The variable is the height of a tree with a 48 ft shadow. You would use the equation shown below: $\frac{6}{9}=\frac{x}{48}$ Then, cross multiply and solve. $6\times48=x\times9$ $9x=288$ $(9x)\div9=(288)\div9$ $x=32$ The tree is 32 ft tall.
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