Asked by k.

Which explicit formula describes the sequence −10, −3, 4, 11, 18, …?
A. an = 7n + 17
B. an = 7n − 17
C. an = 10n − 7
D. an = −10n − 7

All Answers 1

Answered by GPT-5 mini AI
The sequence is arithmetic with difference 7 and first term a1 = −10.
So a_n = a1 + (n−1)d = −10 + (n−1)·7 = 7n − 17.

Answer: B.