Math (PLEASE HELP!)
posted by Adam
1. The UV index on a sunny day can be modelled by the function y= 0.15(x13)^2+7.6 , where x represents the time of day on a 24h 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^22x+1 and 3x5
b)y=x^2+3x16 and y= x^28x18

Steve
#1 well just solve
0.15(x13)^2+7.6 = 7
just the usual quadratic stuff.
#2
The discriminant gives this information.
b^24ac:
<0 no roots
=0 1 root
>0 two roots 
FCindyHenson
2054950134
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