An envelope from the post office is 3 inches wide with a total area of 30 square inches. what is the height of the envelope

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

Can someone check if i did this right since i really want to make sure it’s correct. if you do you so much

What is the interquartile range of this day at set?