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Ostrovityanka [42]
3 years ago
10

What is the sum of an 8-term geometric series if the first term is -11, the last term is 859,375, and the common ratio is -5?

Mathematics
1 answer:
NikAS [45]3 years ago
3 0
Formula of the sum of the 1st nth term in a Geometric Progression:


Sum = a₁(1-rⁿ)/(1-r), where a₁ = 1st term, r = common ratio and n= rank nth of term (r≠1)

Sum = (-11)[1-(-5⁸)] /[(1-(-5)]

Sum = (-11)(1- 390625)/(6)


SUM = 716,144
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