Answer: 
Step-by-step explanation:
The formula for finding the nth term of an arithmetic sequence is given as:

first term = -15
common difference = -6 - (-15) = 9
number of terms
substituting into the formula , we have :


Answer: 125
Step-by-step explanation:
5^3=5*5*5=125
-5^3=(-5)*(-5)*(-5)=25*(-5)=-125