In this question how do you know when to add or subtract?? Simplify

Question

100^12/100^8

A.100^12/8
B.100^96
C.100^4
D.100^20

Is the answer C or D?? Thank you

Answer 1

100^12/100^8 = 100^12-8 = 100^?
When you move the 100^8 from the denominator to the numerator, you change the sign of the exponent and 12-8 = 4.

Answer 2

Thank you😳

Answer 3

DO you now understand?