3 years ago

Find the volume of 63 x 7

Mathematics

2 answers:

Iteru [2.4K]3 years ago

7 0

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beks73 [17]3 years ago

3 0

Answer:

go to this website! I think this will help u!

Step-by-step explanation:

http://mathcentral.uregina.ca/QQ/database/QQ.09.06/debbie1.html

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Can someone delete my Question Like A MODERATOR

DochEvi [55]

Answer:

im not moderator

Step-by-step explanation:

dont post a question like this

8 0

2 years ago

Find the sum of the first 8 terms of the series. 1/2 + 1 + 2 + 4

Roman55 [17]

$\bf \cfrac{1}{2}~~,~~\stackrel{2\cdot \frac{1}{2}}{1}~~,~~\stackrel{2\cdot 1}{2}~~,~~\stackrel{2\cdot 2}{4}~~,...$

so as you can see the common ratio is 2, and the first term is 1/2,

$\bf \qquad \qquad \textit{sum of a finite geometric sequence} \\\\ S_n=\sum\limits_{i=1}^{n}\ a_1\cdot r^{i-1}\implies S_n=a_1\left( \cfrac{1-r^n}{1-r} \right)\quad \begin{cases} n=n^{th}\ term\\ a_1=\textit{first term's value}\\ r=\textit{common ratio}\\ ----------\\ r=2\\ a_1=\frac{1}{2}\\ n=8 \end{cases} \\\\\\ S_8=\cfrac{1}{2}\left( \cfrac{1-2^8}{1-2} \right)\implies S_8=\cfrac{1}{2}\left( \cfrac{-255}{-1} \right)\implies S_8=\cfrac{255}{2}$