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Vera_Pavlovna [14]
2 years ago
6

The fifth term of a geometric sequence is 781.25. Each term of the sequence is 1/5 of the value of the following term. Which rec

ursive formula represents the situation?
Answer choices are in the image attached.

Mathematics
1 answer:
lubasha [3.4K]2 years ago
6 0

The recursive formula of the geometric sequence is a_{n} = 5a_{n-1} and a1 = 1.25

<h3>How to determine the recursive formula?</h3>

The given parameters are:

Fifth term = 781.25

Term = 1/5 * following term

The second parameter above means that:

a_n = \frac{1}{5} * a_{n+ 1}

Multiply both sides by 5

a_{n+1} = 5a_n

Remove 1 from the terms

a_{n} = 5a_{n-1}

Using the formula a_n = \frac{1}{5} * a_{n+ 1}, we have the first term to be:

a_1 = \frac 15 * a_2

a_2 = \frac 15 * a_3

a_3 = \frac 15 * a_4

a_4 = \frac 15 * a_5 = \frac 15 * 781.25 = 156.25

So, we have:

a_3 = \frac 15 * 156.25 = 31.25

a_2 = \frac 15 * 31.25 = 6.25

a_1 = \frac 15 * 6.25 = 1.25

Hence, the recursive formula is a_{n} = 5a_{n-1} and a1 = 1.25

Read more about recursive sequence at:

brainly.com/question/1275192

#SPJ1

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