1998jzavjzav
1998jzavjzav 1998jzavjzav
  • 25-07-2017
  • Mathematics
contestada

What is the sum of the first five terms of a geometric series with a1=20 and r=1/4

Respuesta :

irspow
irspow irspow
  • 25-07-2017
The sum of a geometric sequence is:

s(n)=a(1-r^n)/(1-r), a=initial term and r=common ration so

s(n)=20(1-0.25^n)/(1-0.25)

s(5)=20(1-0.25^5)/(0.75)

s(5)=26.640625
Answer Link
haleyfordice75 haleyfordice75
  • 10-04-2019

Answer: 26.640625

Step-by-step explanation:

Answer Link

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