Question

Find an equation for the nth term of the arithmetic sequence.

-15, -6, 3, 12,

Answer 1

The general equation for the n-th term is
a+(n-1)d.
Do you know what each letter stands for?

Answer 2

no, i never paid attention in class and thats why im redoing it online :/

Answer 3

a is the first term and d is the difference. You should be able to work it out now.

Answer 4

but what is the n-1?

Answer 5

You're supposed to provide the n-th term right?

Answer 6

Just simplify then you have your n-th term.

Answer 7

so it would be -15+(n-1)-9?

Answer 8

Simplify more.

Answer 9

an = -15 + 9(n - 1)

Answer 10

Almost done.

Answer 11

thats one of the choices

Answer 12

an = -15 + 9(n + 1)

an = -15 x 9(n - 1)

an = -15 + 9(n + 2)

an = -15 + 9(n - 1)