Answer
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
$x=12$
Algebra 1
by Hall, Prentice
Published by
Prentice Hall
ISBN 10:
0133500403
ISBN 13:
978-0-13350-040-0
Chapter 2 - Solving Equations - 2-8 Proportions and Similar Figures - Practice and Problem-Solving Exercises - Page 134: 8
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