Precalculus

1.Find the explicit formula for the general nth term of the arithmetic sequence described below, simplify your answer.

7,2,-3,-8,-13

2. Find the explicit formula for the general nth term of the geometric sequence described below:

a2 = -18 and a5= -486 and r is greater than 0.

3. Find the explicit formula for the general nth term of the geometric sequence described below:

-4,12,-36,108,-324…

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