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OpenStudy (anonymous):
The length of a rectangle is three times longer than its width. The perimeter of the rectangle is 16 feet. If x represents the width of the rectangle, which equation can be used to find its value? a. 3x + x = 16 b. (3x)(x) = 16 c. 3x + 3x + x + x = 16 d. 3x + 3x + x = 16 The answer I got was b, but I'm not entirely sure.
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