What is the measurement of the missing side-length?

How do you determine whether a relationship represented as as graph is linear or nonlinear

Factor the polynomial by its greatest common monomial factor.

The first term of a sequence is -12. the recursive formula for the sequence is an = an-1 + 9. what are the next 3 terms in the sequence? a) -3, -15, -27 b) -3, 6, 15 c) -3, -6, -3 d) -3, -6, 3