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