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PLEASE HELP QUICKLY! 30 POINTS AND WILL MARK BRAINLIEST.

Write an equation for the th term of the arithmetic sequence below.
-12, -3, 6, ...

A. f(n)=-9n-21
B. f(n)=9n-21
C. f(n)=9n+21
D. f(n)=-9n+21

Respuesta :

Answer:

c

Step-by-step explanation:

you need to find how the numbers increase each time to help you.

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