2r-20 is the answer combining the like terms and solving.
The answer is 8^18...
3*6 = 17 and the 8 stays the same
Associative property of mulipication, the ability to move parenthasees with mltipication or additon
C.
If each 1/2 is cut in 4 than you would have to multiply that by 2 because it's only half. Then since you're finding what fraction is it you would put a 1 on top and say 1/8.