Given the arithmetic sequence where a1=-5 and d=6, what is a5?

In exercises 1-5, find the sum of the arithmetic sequence having the data given. Project 8.02 

a1 = 5, an = 3, n = 20 

a1 = 7, d = - 3, n = 20 

a1 = 81, an = - 13, n = 20 

a1 = 5, d = 7, n = 120 

an = 5, d = -2, n = 12