PLEASE HELP ME! For a geometric sequence, if a1 = 2 and a5 = 1250, what is the value of r?

asked Mar 9, 2023 234k views

4 votes

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11 votes

Answer: r = 5

Steps:

a_n=ar^(n-1)

1. add Values to formula

1250=2r^(5-1)

2. get r alone

(1250)/(2)=(2r^(4))/(2) ➜
625= r^4
3. get rid of the exponents

$\sqrt[4]{625}= \sqrt[4]{r^4}$ ➜
$\sqrt[4]{625}= r=5$

r = 5

Rabbitco answered Mar 13, 2023

6.3k points

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