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5 September, 10:02

Express the formula P = 21 2w in terms of length, L. Use the new to find the length when the perimeter is 68 and the width is 13.

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  1. 5 September, 10:51
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    l = P/2 - w 21

    Step-by-step explanation:

    We know the perimeter formula to be ...

    P = 2L + 2W

    Dividing by 2 and subtracting W lets us write the formula for L:

    P/2 = L + W

    L = P/2 - W

    __

    For the given measurements, the length is ...

    L = 68/2 - 13

    L = 21
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