Is there a formula I need to use to be able to find the answer this question?

1. A motorcycle stunt rider jumped across the Snake River . The path of his motorcycle Was GIVEN approximately by the function Hit 1 = _ 0.0005x 2 + 2.30x + 600. where IT is measured in feet above the river and * is the horizontal distance from his launch ramp . How high above the river was the launch ramp ? What was the rider's maximum height above the river , and how far was the rider from the ramp when he reached the maximum height ?quot