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15 July, 08:22

The perimeter of a rectangle is 42 inches. if the width of the rectangle is 6 inches, what is the lenght

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  1. 15 July, 08:50
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    The perimeter of rectangle: P = 2a + 2b

    P = 42 in; a = 6 in; b = ?

    subtitute

    2 · 6 + 2b = 42

    12 + 2b = 42 |subtract 12 from both sides

    2b = 30 |divide both sides by 2

    b = 15 (in)
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