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Artyom0805 [142]
3 years ago
11

HELP ASAP PLZZZZ

Mathematics
1 answer:
Alisiya [41]3 years ago
8 0

Answer:

the answer is D

Step-by-step explanation: you have to take the 3.14 and radius (base) of the cone and make it into a square 9 (9 times 9) then take the height and divide it by 3, after solving the height divided by 3 problem and square 9 you have to multiply them together and there you go!

here's a little example:

V=πr2h

3=π·92·15

3≈1272.34502

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Determine the sum of the first 9 terms in the geometric series where r= -0.25 and a1= 256.
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\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=-0.25\\ a_1=256\\ n=9 \end{cases}

\bf S_9=256\left(\cfrac{1-(-0.25)^9}{1-(-0.25)}  \right)\implies S_9=256\left( \cfrac{1+0.25^9}{1+0.25} \right) \\\\\\ S_9=256\left(  \cfrac{52429}{65536}\right)\implies S_9=\cfrac{52429}{256}\implies S_9=204.80078125

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