Posted by BARBARA on Wednesday, April 25, 2012 at 9:55pm.
THE PRIMETER OF SOME TRAFFIC SIGN MUST BE 78INCHES ALSO ITS LENGTH IS 7INCHES LONGER THAN ITS WIDTH
FIND THE DIMENSIONS OF THE SIGN
WHAT IS THE LENGTH
WHAT IS THE WIDTH

COLLEGE ?? ALGEBRA  Ms. Sue, Wednesday, April 25, 2012 at 9:56pm
What is the shape of the sign?

COLLEGE ALGEBRA  Anonymous, Wednesday, April 25, 2012 at 10:14pm
Assuming the sign is rectangular, your initial formula is
P = 2L + 2W
You know the perimeter is 78 inches so replace P with 78.
78 = 2L + 2W
You know that the length is 7 inches longer than the width.
78 = 2(W + 7) + 2W
Simplify.
78 = 2W + 14 +2W
78 = 4W + 14
Solve for W, the width.
64 = 4W
16 = W
Add 7 to find the length.
16 + 7 = L
23 = L
The length is 23 inches. The width is 16 inches.
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