Question

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

-3, -5, -7, -9, ...

is it an = -3 + -2(n)????

Answer 1

That's a great first effort. Why not let n=1, 2, 3, and so on, and see whether your formula correctly predicts the next term? If it does, great. If it doesn't, fix the formula.

Answer 2

I'd suggest not writing +-; decide whether you want + or -. One or the other!

Answer 3

okay it's wrong i never got -3

Answer 4

i think it's this one
an = -3 + -2(n - 1)

Answer 5

it worked for me

Answer 6

is it correct?

Answer 7

Mind explaining in a bit more depth what you meant when y ou typed, "it worked for me?"

Answer 8

Why not demonstrate how your formula behaves? Choose n=1, 2, 3, and so on.
Does it give you -3, -5, -7, -9, and so on?

Answer 9

an = -3 + -2(n - 1)
yea i used my calculater to plug in the numbers and i got the numbers up there from this equation^

Answer 10

OK, great. Just omit that + sign and you're all set.

Answer 11

Okay thankyouu

Answer 12

Thanks for the medal! Good luck.