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attashe74 [19]
3 years ago
12

Wally Beige has painted a rectangular mural that is 7 ft tall and 11 ft wide. He plans to paint a border of equal width all the

way around the outside of the mural. To end up with a border that has an area of 88 square ft, find the width of the border.
Mathematics
1 answer:
4vir4ik [10]3 years ago
7 0

Answer:

Width = 4ft

Step-by-step explanation:

Area of the rectangular mural = Length × Breadth

7 ft tall and 11 ft wide.

(11 - 2W)(7 - 2W) = 88

77 -22W - 14W + 4W² = 88

77 -36W + 4W² = 88

4W² - 36W + 77 - 88

= 4W² - 36W - 11

W = 4ft

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