The cross-section of a searchlight mirror is shaped like a parabola. The light bulb is located 6 centimeters from the base along the axis of symmetry. If the mirror is 15 centimeters across at the opening, find its depth in centimeters.

Me with this assignment ! i only partially understand, so explain. also it's a work sample. at the championship bike race, steve and paula were fighting for first place. steve was 175 feet ahead of paula and had only 300 feet left to go. he was very tired and was going only 9 feet per second. paula was desperate to catch up and was going 15 feet per second. who won the bike race and by how far did she/he win?