An item is regularly priced at $72. Keiko bought it on sale for 80% off the regular price. How much did she pay?

Solve for x, y, and z. show all steps.

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

The parabola x= √y-9 opens: a.)up b.)down c.)right d.)left