The sequences below are either arithmetic or geometric. For each sequence, determine whether i it is arithmetic or geometric, and write the formula for the nth term an of that sequence

TYPE nth term formula

-6, -8, -10, ...

27, -9, 3, ...

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-6, -8, -10,... Arithmetic a_n=a1+(n-1)d=-6+(n-1)(-2)=-2n-4

27, -9, 3,... Geometric a_n=a1*r^(n-1)=27(-1/3)^(n-1)

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