So for the top you will distribute the 3 exponent outside the parenthesis into each variable inside the parenthesis, meaning that you get 4(3^3 * x^6 * y^12), so we know that 3 cubes equals 27, and times 4 we get 108. This means that the top equals 108x^6 y^12, and now we do the same for the bottom, so we distribute 4 into each variable to get 2^4 x^12 y^20. 2^4 equals 16, so the bottom equals 16x^12 y^20. So you get (108x^6y^12)/(16x^12y^20). If you were to divide the top by the bottom you would get 6.75/(x^6y^8).