The dimensions of the rectangle are length is 6.7 inches and its width is 3.7 inches.
The formula for the perimeter of a rectangle is P = 2L + 2w,
where l is the length and w is the width.
We know that
21 = 2L + 2W
and
L = W + 3
then:
21 = 2(W+3) + 2W
21 = (2*W + 2*3) + 2W
21 = 2W + 6 + 2W
21 = 4W + 6
21 - 6 = 4W
15 = 4W
W = 15/4
W = 3.7
Now, L = W+3
L = 3.7+ 3
L = 6.7
Therefore, the dimensions of the rectangle are length is 6.7 inches and its width is 3.7 inches.
The complete question is
"The formula for the perimeter of a rectangle is P = 21 + 2w, where l is the length and w is the width. A rectangle has a perimeter of 21 inches. Find its dimensions if its length is 3 inches greater than its width."
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