Math (PLEASE HELP!)

posted by Adam

1. The UV index on a sunny day can be modelled by the function y= -0.15(x-13)^2+7.6 , where x represents the time of day on a 24-h clock and f(x) represents the UV index. At what time(s) was the UV index 7?

2. Determine if each system has one, two, or no solutions. (Show your work - 3 marks each)
a)y=2x^2-2x+1 and 3x-5
b)y=x^2+3x-16 and y= -x^2-8x-18

  1. Steve

    #1 well just solve

    -0.15(x-13)^2+7.6 = 7
    just the usual quadratic stuff.

    #2
    The discriminant gives this information.
    b^2-4ac:
    <0 no roots
    =0 1 root
    >0 two roots

  2. FCindyHenson

    205-495-0134

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