A paper airplane was thrown from the top of a tall building. The height of the paper airplane above the ground can be found using the function, y=-1.5x+60 where x is the time in seconds the airplane has been in the air

How many seconds did it take the paper airplane to reach the ground?

A paper airplane was thrown from the top of a tall building The height of the paper airplane above the ground can be found using the function y15x60 where x is class=