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20 March, 00:38

A rectangular garden plot must have a central planting area of length 13 m and width 8 m. there is to be a sidewalk around its perimeter with a width ww. if the total area, planting area plus sidewalk area, is 152 m22, what is the sidewalk width ww in meters?

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  1. 20 March, 00:56
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    (13+2w) * (8+2w) = 152

    104+26w+16w+4w²-152=0

    4w²+42w-48=0

    w = (-21+√633) / 4≈1 (m)
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