First, since all of the terms are multiplied, you can cancel them out to simplify them:
18/9 = 2
When a term has exponents on the top and bottom of a fraction, you subtract the bottom from the top:
c^8/c^3 = c^5
d^9/d^6 = d^3
So now, we can get rid of the fraction bar and put all of these terms into one expression:
2(c^5)(d^3)
