laurenosborn laurenosborn

24-04-2017
Mathematics

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Someone please help me find the sum of these geometric series!!
Thank you so much

Someone please help me find the sum of these geometric series Thank you so much class=

Someone please help me find the sum of these geometric series Thank you so much class=

Respuesta :

apologiabiology apologiabiology

25-04-2017

sum of aritmetic sqeuqnece is
(n/2)(a1+an)
a1=first term
an=nth term
n=how many terms

so we gots
a1=3(1)-4=-1
a18=50
n=18
(18/2)(-1+50)
(9)(49)
441

other one
a1(1-r^(n+1))/(1-r)

2(1-2^(15+1))/(1-(1/4))
about 2 and 2/3, so closer to 3

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