November 29, 2015

Homework Help: confused+ math!

Posted by Anonymous on Tuesday, October 17, 2006 at 7:30pm.

A finite geometric sequence has t1= 0.1024 and t2= 0.256 how many terms does this sequence have if its middle temr has the value 156.25?

how would go about and do this question?

If t1 = 0.1024 and t2 = 0.256, then the common ratio is t2/t1 = 2.5
The value at term n is given by .1024 * 2.5 n-1, therefore solve
156.25 = .1024 * 2.5 n-1 to find the middle term.

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