When multipled
cm^1 x cm^1 x cm^1 = cm^3 or cc for cubic centimeters the answer is A.
There are six possibilities, and one of those possibilities is a 3.
Therefore, the probability of rolling a 3 is: 1/6.
Knowing the power rule:
dx*n*x^(n-1) all you'd need to do is bring the 7 down and multiply it by -3, then subtract 1 from 7. Because dx is 1 you don't need to worry about it (you'll use chain rule for that)
So your final answer should be dy/dx= -21x^6