4804341040
24.06.2021 •
Mathematics
Hello, can anyone do my school work for me or at least help me? I'm in 6th grade in FLVS I need to finish by July 15 i need help, please, ill give you the info like username and password to the school account; please, I'm desperate
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Ответ:
sum formula = s = a(1-r^n) / (1-r)
3640 = a (1 - 3^6) / (1-3)
3640 = a (1-729) / (-2)
Cross multiply
3640 * (-2) = a * (1-729)
- 7280 = a * (-728)
7280 = a * 728
Dividing by 728
a = 10 : Answer
Hope it will help :)