Question

Find the 15th term of the arithmetic sequence if a1 = -3 and d = 2

Answer 1

25

Explanation:

a1 = - 3 Given

d = 2 Given

n = 15 Given

Formula

tn = a1 + (n - 1) * d

Substitute and solve

t15 = -3 + (15 - 1) * 2 Calculate what's in the brackets.

t15 = -3 + 14*2 Combne

t15 = -3 + 28 Add the two terms

t15 = 25