Use the graphing calculator to graph the quadratic function y=2x^2 + 2x -40. what are the zeros of the function

a.4 and -5
b.-4 and 5
c.-5 and -40
d.4 and -40

Acyclist bike x distance at 10 miles per hour .and returns over the same path at 8 miles per hour.what is the cyclist average rate for the round trip in miles per hour ?