Your eyes shoot open, and you're lying in the leafy substrate of a dark forest...wait, what is that?

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I'm stuck on a problem ... any help would be appreciated.---A stunt motorcyclist makes a jump from one ramp 20 feet off the ground to another ramp 20 feet off the ground. The jump between the ramps can be modeled by y = -1/640x^2 + 1/4x + 20 where x is the horizontal distance (in feet) and y is the height above the ground (in feet).*insert diagram*a. What is the motorcycle's height r when it lands on the ramp? (I've got this one -- it's stated above to be 20 ft.)b. What is the distance d between the ramps?c. What is the horizontal distance h the motorcycle has traveled when it reaches its maximum height?d. What is the motorcycle's maximum height k above the ground?---I also need to get this done really soon ... like, in two hours.EDIT: I think I got it ... finally ...