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algebra

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You live near a bridge that goes over a river. The underside of the bridge is an arch that can be modeled with the function y=-0.000475x^2+0.851x, where x and y are in feet. How high above the river is the bridge(the top of the arch)? How long is the section of bridge above the arch?

Would appreciate if someone could help me..

  • algebra -

    Could someone please explain this question to me.

  • algebra -

    Answer for this QC fro CA students.
    1. A
    2. C
    3. A
    4. B
    5. B

  • algebra -

    The answer is: The bridge is about 381.16 ft above the river, and the length of the bridge above the arch is 1,791.58

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