Posted by Cody on Sunday, October 14, 2012 at 10:11pm.
On his 13th birthday he was 112cm tall and on his 14th birthday he was 121cm tall. Assume a geometric monthly growth rate. What is this rate?
I just need to know how to set it up. Please and thanks

Math. easy?  Reiny, Sunday, October 14, 2012 at 10:25pm
let the monthly rate be r
then 112(1+r)^12 = 121
(1+r)^12 = 1.080357..
take 12th root
1+r = 1.0064618
r = .0064618  monthly rate
BTW, I answered this question for somebody yesterday, perhaps it was you.
In that solution I missed the "monthly" part and took it as an annual rate
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