(03.01) A relation is (1 point)
o the output (y) values of the relation
O the input (x) values of the relation
O a set of points that pair input values with output values
O x and y values written in the form (x, y)

which one is it?

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)