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dolphi86 [110]
3 years ago
11

Another sigma notation question. Please check. Hopefully I did this one correctly!

Mathematics
1 answer:
Neko [114]3 years ago
8 0

Answer:

Your answer is correct.  The series is a geometric series with common ratio -1/4 and first term 40.  So each term is:

an = 40 (-1/4)^(n−1)

So the sum of the first 10 terms is:

∑(n=1 to 10) [ 40 (-1/4)^(n−1) ]

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