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Mathematics 87 Online
OpenStudy (anonymous):

What is the sum of the geometric sequence 4, 12, 36 … if there are 9 terms?

OpenStudy (anonymous):

ok well first you have S=4(1-3^9) take ans and divide by -2

OpenStudy (anonymous):

i got 39364

OpenStudy (anonymous):

duz it help? geonetric summation formula is summation=1st term * 1-common ratio to the nth power. take ans and divide by 1-common ratio

OpenStudy (anonymous):

yeah thank u!

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