What are all the common factors of 36 and 56?

A.
1, 2, 4

B.
1, 2

C.
1, 2, 4, 8

D.
1, 2, 3, 4, 9

What is 243 written as a power of a number?

A.
813

B.
34

C.
35

D.
53

What is the prime factorization of 126?

A.
22 • 3 • 7

B.
2 • 32 • 7

C.
2 • 3 • 7

D.
2 • 32 • 72