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college math

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Braking distance The braking distance y in feetthat it takes for a car to stop on wet ,level pavement can be estimated by y = 1/9 x^2, where the x is the speed of the car in miles per hour Find the speed associated with with each braking distance.
(a.) 25 feet (b.) 361 (c.) 784

  • college math -

    Y = (1/9)(X^2) = X^2/9.

    a. Y = X^2/9 = 25 ft.
    X^2/9 = 25,
    Multiply both sides by 9:
    X^2 = 225,
    X = 15 Miles/hr.

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    post it.

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