The rectangles are similar. Find x.

Answer:
From scale factors:
[tex] \frac{18"}{12"} = \frac{x}{5"} \\ \\ x = \frac{18" \times 5"}{12"} \\ \\ x = \frac{90"}{12"} \\ \\ x = 7 \frac{1}{2} "[/tex]