Question

What is the sum of the geometric series?

Answer 1

@dan815

Answer 2

@wrstlr3232

Answer 3

(A). 10 (B). 21 (C). 21/8 (D). 21/2

Answer 4

@Luigi0210

Answer 5

@ParthKohli

Answer 6

\(\large \begin{align} \color{black}{\sum_{i=1}^{3} 8\times \left(\frac{1}{4}\right) ^{(i-1)} \hspace{.33em}\\~\\
=8\times \left(\frac{1}{4}\right) ^{(1-1)}+8\times \left(\frac{1}{4}\right) ^{(2-1)}+8\times \left(\frac{1}{4}\right) ^{(3-1)} \hspace{.33em}\\~\\
}\end{align}\)

Answer 7

do I actually minus those exponets together first ex. (1-1)(2-1)(3-1).

Answer 8

\(\large \begin{align} \color{black}{\normalsize \text{u should proceed like this} \hspace{.33em}\\~\\
=8\times \left(\frac{1}{4}\right) ^{(1-1)}+8\times \left(\frac{1}{4}\right) ^{(2-1)}+8\times \left(\frac{1}{4}\right) ^{(3-1)} \hspace{.33em}\\~\\
=8\times \left(\frac{1}{4}\right) ^{(0)}+8\times \left(\frac{1}{4}\right) ^{(1)}+8\times \left(\frac{1}{4}\right) ^{(2)} \hspace{.33em}\\~\\
}\end{align}\)

Answer 9

(A). 10

Answer 10

Well I got 10.5, but there is no 11 so I went with A.

Answer 11

Nevermind its (D). opps(: