Question

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

Answer 1

First you need to know what this is geometric series. so, what is it

Answer 2

A geometric series sum_(k)a_k is a series for which the ratio of each two consecutive terms a_(k+1)/a_k is a constant function of the summation index k. The more general case of the ratio a rational function of the summation index k produces a series called a hypergeometric series.

Answer 3

it is this right

Answer 4

?

Answer 5

idk. ive never learned this before