For a particular type of model airplane, the distance, in meters, it can fly off of a mechanical launch depends on its mass, m in grams, given by the function D(m)= 0.13m - 0.0001m^2

1. How far would a 700 gram airplane fly? ______meters
2. What mass of airplane will fly the farthest? ________grams
3. Airplanes heavier than what mass will not fly at all? ______grams