Question

What is the formula for the following arithmetic sequence?

-9, -2, 5, 12, ...

an = -9 + 7( n - 1)
an = -9 + (-7)( n - 1)
an = 7 + (-9)( n - 1)
an = 9 + (-7)( n - 1)

Answer 1

Explanation:

an = -9 + 7(n-1)

because you start at -9 and go up by increments of 7