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January 30, 2015

January 30, 2015

Posted by **MARIAH** on Tuesday, October 26, 2010 at 6:18pm.

Marie has a rectangular board 18 inches by 23 inches around which she wants to put a uniform border of shells. If she has enough shells for a border whose area is 282 square inches, determine the width of the border. (the border has x's as the width and length)

- MATH HELP NOW -
**MathMate**, Tuesday, October 26, 2010 at 6:52pmSo the board AND the border have an area of

A2=(18+x)(23+x)

The board alone is

A1=18*23

A2-A1=282

Solve for x.

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