Addilyn's bedroom has a perimeter of 40 inches; the width is 8 feet. What is the length of her room?

If Addilyn wants to put a wallpaper border around her bedroom four times, what length of wallpaper border should she buy?

Length = 12 ft, she should buy 160 ft. of wallpaper border

Step-by-step explanation:

In order to find perimeter, you have to add up the values of all of the sides. Assuming that Addilyn's bedroom is a rectangle, we can use this equation to find the length:

8 + 8 + l + l = 40

Combine like terms

16 + 2l = 40

subtract 16 from both sides to isolate the 2l

2l = 24

Divide both sides by 2 to isolate the l

l = 12

The length of her room is twelve feet.

If she wants to put the border around the room four times, that means we'll have to multiply the perimeter by 4 to find out what length of wallpaper border she should buy.

4 * 40 = 160

She should buy 160 ft of wallpaper border.