3x - 5x^2

Not able to submit without it being 20 characters :/

Ineed i been stuck on this question since yesterday

What is the percentile for data value 6 in the following data set? 4 13 8 6 4 4 13 6 4 13 2 13 15 5 9 4 12 8 6 13 40 25 35 62

Write an equation for the function that includes the points (2,100)and (3,100)