## Suppose a term of a geometric sequence is a4 = 121.5 and the common ratio is 3. Write the formula for this sequence in the form an = a1 ⋅ rn

Question

Suppose a term of a geometric sequence is a4 = 121.5 and the common ratio is 3. Write the formula for this sequence in the form an = a1 ⋅ rn−1. Explain how you arrived at your answer.

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5 months 2021-08-04T20:21:02+00:00 1 Answers 30 views 0

Step-by-step explanation:

Given

Required

Substitute 4 for n in

Substitute 121.5 for

Solve for a1

So, we have: