Can you help me find this answer question 3a, b plz

Monica build a remote control toy airplane for science project to test the plane she launched it from the top of a building the plane travel a horizontal distance of 50 feet before landing on the ground a quadratic function which models the height of the plane in feet relative to the ground at a horizontal distance of x feet from the building is shown

Write an equation in point-slope form for the line through the given point that has the given slope (-2,-7); m=-3/2

How far could you drive on 50 gallons of gas