Question

Find an explicit formula for the arithmetic sequence -31,-27,-23,-19,...

Answer 1

−31+4(n−1)

Explanation:

hope this helps

Answer 2

First term (a) = -31

Common Difference (d) = -27 - (-31) = -27 + 31 = 4

nth term = a + (n - 1)d = -31 + (n - 1)4 = -31 + 4n - 4 = 4n - 35

Hence, the formula is 4n - 35.