Help please dhskksbsjsjsbsis

If 1 km = 0.621 miles, how many miles are in a centimeter

Given right triangle xyz, which correctly describes the locations of the sides in relation to

How do i start to solve? would appreciate a walk-thru! a bird sitting 16ft above the ground in an apple tree dislodges an apple. after how many seconds does the apple land on the ground? (assuming that no branches will interfere with it's fall)