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OpenStudy (zab505):
What is the sum of the first five terms of a geometric series with a1 = 20 and r = 1/4? Express your answer as an improper fraction in lowest terms without using spaces.
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OpenStudy (campbell_st):
well you can use the formula \[S_{5} = \frac{a(1 - r^5)}{1 - r}\] just substitute a1 and r...
OpenStudy (zab505):
1705/64?
OpenStudy (campbell_st):
yep... looks correct to me
OpenStudy (zab505):
Thank you so much!
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