Answer:
The width of the rectangle is 9 inches.
Step-by-step explanation:
The formula of perimeter is Perimeter = 2·length + 2·width. The length is 20. If we call "x" to the width.
Perimeter = 2·(20) + 2·x ⇒ Perimeter = 40 + 2x ⇒ 58 =40 + 2x ⇒
58 -40 =2x ⇒ 18 = 2x ⇒18/2 = x ⇒ 9 = x.
The width of the rectangle is 9 inches.
