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12 July, 09:34

A tunnel with a parabolic arch is 12m wide. If the height of the arch 4m from the left edge is 6m, can a truck that is 5m tall and 3.5 m wide pass through the tunnel?

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  1. 12 July, 11:47
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    Yes, here is the explanation:

    y = - 3/16 x (x-12)

    5 = - 3/16x (x-12)

    16*5 = - 3/16*16x (x-12)

    80 = - 3x^2 + 36x

    3x^2 - 36x + 80 = 0

    a = 3, b = - 36, c = 80

    x = - (-36) + / - √ (-36) ^2 - 4 (3) (80) / 2 (3)
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