A BIRD IS 1000 FEET HIGH AND DECIDES TO DROP AT THE RATE OF 2 FEET PER SECOND. WRITE THE EQUATION FOR THIS , SET IT EQUAL TO ZERO AND SOLVE FOR HOW LONG IT WILL TAKE HIM TO LAND ON THE GROUND. REMEMBER TO USE - 2 X TO REPRESENT HIS DROP. SET THE EQUATION EQUAL TO ZERO BECAUSE THAT MEANS HE HAS LANDED -- AND IS NO LONGER UP IN THE AIR.