Question

MEDAL!

Find the next three terms of each arithmetic sequence. Then write its recursive formula

-17, -11, -5, 1, ...

My Answers:
7, 13, 19
Recursive Formula: f(n-1) + 6 = f(n)

But the answer key says that the next three terms are 17, 23, and 29. I don't know why or how they got that?

Answer 1

so what did you figure for the common difference
if it is an arithmetic sequence then the difference of term - previous term is always the same

Answer 2

I thought that the common difference was +6.

Answer 3

that's correct
that is how you figure out the next term is to add 6

Answer 4

and you are right 1+6 is 7
and 7+6 is 13
and 13+6 is 19

Answer 5

So the answer key is wrong, correct?

Answer 6

your recursive formula is also right

Answer 7

Thank you!

Answer 8

if this came from a book make sure your answer section is in the right page section you are looking at the right corresponding numbered answer for your numbered question

Answer 9

but even then books are known to be wrong sometimes

Answer 10

i don't see it too often but i have seen it