Which of the following are factors pairs for 63? Select all that apply answer choices. 2x126, 3x21, 4x13, 4x16,7x9

The factor pairs for 63 are:

1 x 63 = 63
3 x 21 = 63
7 x 9 = 63

So the factor pairs for 63 are 1x63, 3x21, and 7x9.