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15 February, 00:14

A student says that the perimeter of a rectangle side lengths (2x-1) inches and 3x inches can be written as (10x-1) inches because 2 (2x-1) + 2 (3x) = 10x-1. Explain why this statement is incorrect

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  1. 15 February, 00:17
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    P = 2L + 2W

    P = 2 (2x - 1) + 2 (3x) = 4x - 2 + 6x = 10x - 2

    the student distributed wrong ... 2 (2x - 1) = 4x - 2 ... added to 6x = 10x - 2, not 10x - 1
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