The answers are 2 and 3. After multiplying together cy^3 and 9y^d, you'll get 9c*y^d+3. From there, set it equal to 18y^6. You can split apart 18y^6 into 18 and y^6, so you can solve for the different variables. Split apart 9c*y^d+3 into 9c and y^d+3, and set 9c=18. C will equal 2. Solve the other to get 3.