What is the difference between fall and drop?

The difference between fall and drop is that falling is a object moved freely and rapidly, to a higher or lower level, while drop is the act of letting or making something fall vertically. They appear the same with a slight difference if you speculate it carefully.

. a function is a relation in which each input has only one output. in the relation , y is a function of x, because for each input x (1, 2, 3, or 0), there is only one output y. x is not a function of y, because the input y = 3 has multiple outputs: x = 1 and x = 2.

the answer would be b.