SOLUTION: Find the probability that the vertex of the graph y=x^2-8x+c is above the x-axis if the c is a randomly selected integer from 1 to 20. I've tried so many things and I just can'

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Question 860815: Find the probability that the vertex of the graph y=x^2-8x+c is above the x-axis if the c is a randomly selected integer from 1 to 20.
I've tried so many things and I just can't figure out how to even set up the problem. I'm just so confused and could really use some help.
Answer by ewatrrr(24785)   (Show Source): You can put this solution on YOUR website!
 

Hi,

y=x^2-8x+c 

y = (x-4)^2 - 16 + c

To be above the y axis,  c > 16

P(17 0r 18 0r 19 0r 20) =

 

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