4^4x4^6

A.4^2
B.4^6
C.4^10
D.4^24

Help?

4^4 * 4^6 = 4^(4+6) = 4^10

you add exponents, since what you are really doing is just short for

4x4x4x4 x 4x4x4x4x4x4 = 4x4x4x4x4x4x4x4x4x4

just as multiplication is short for

4x4 + 4x6 = 4x(4+6)

4+4+4+4 + 4+4+4+4+4+4 = 4+4+4+4+4+4+4+4+4+4