# Chapter 2 - Solving Equations - 2-8 Proportions and Similar Figures - Practice and Problem-Solving Exercises - Page 134: 8

12

#### Work Step by Step

Because the figures are similar, we can create the following proportion: $\frac{18}{x}=\frac{7.5}{5}$ cross multiply $7.5x=90$ divide both sides by 7.5 $7.5x\div 7.5=90\div7.5$ simplify $x=12$

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