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22 April, 21:58

You can model an arch at your school using the equation y=-0.8 (x-5) (x+5), where x and y are measured in feet. The x-axis represents the ground. Find the width of the arch at ground level.

The width of the arch at ground level is ___ feet.

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  1. 22 April, 23:01
    0
    10 ft

    Step-by-step explanation:

    At ground level, y = 0. Setting - 0.8 (x-5) (x+5) = to 0, we get x = 5 and x = - 5 as solutions. The arch touchs the ground at x = - 5 and x = 5 ft.

    The width of the arch at ground level is 5 - (-5), or 10 ft.
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