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

PLEASE HELP ME! For a geometric sequence, if a1 = 2 and a5 = 1250, what is the value-example-1

1 Answer

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

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