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1 May, 03:33

After a rainstorm, a rainbow appears across the sky in the shape of a parabola. The equation of the parabolic rainbow is y = - x 2 + 100, where 2x is the width and y is the height. How wide is the rainbow 25 miles above the ground?

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  1. 1 May, 05:23
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    X=37.5

    so 2x=75

    ...
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