Two math questions, help!

Divide. assume that no denominator equals zero.

6d^2/4c divided c^2d^3/18


1. 27/c^3d

2. 24d/c

3. 36c/d

4. Cd^5/12

Divide. assume that no denominator equals zero. divide and simplify completely: d^2-1/d^2-d divided d-1/d

1. D^2-1/d^2

2. D+1/d-1

3. 1

4. D-1/1-d

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