Math

For a contest, students have to solve this problem: The length of a rectangle is 6 cm more than its width. The perimeter of the rectangle is 84 cm. What are the dimensions of the rectangle?

a) One student says the dimensions of the rectangle are 39 cm by 45 cm. Is the student correct? How do you know?

b) What is the answer to the contest problem?

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  1. The rectangle is definitely not 39 by 45 because those two numbers alone = the perimeter. As for the rectangle call the length (x+6) and the width x. Then say that 84=2(x)+2(x+6). solve for x

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