2 years ago

Really easy math :) I REALLY NEED HELP ASAPPPPPP (ill mark yo as brainiest)

Mathematics

1 answer:

Anon25 [30]2 years ago

3 0

Answer:

c = -1/4 = -0.250

Step-by-step explanation:

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3 years ago

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3 years ago

What is the first term in a geometric sequence if the common ratio is − 2 and the sum of the first six terms is −105?

Serggg [28]

$\bf \qquad \qquad \textit{sum of a finite geometric sequence}
\\\\
S_n=\sum\limits_{i=1}^{n}\ a_1\cdot r^{i-1}\implies S_n=a_1\left( \cfrac{1-r^n}{1-r} \right)\quad 
\begin{cases}
n=n^{th}\ term\\
a_1=\textit{first term's value}\\
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----------\\
r=-2\\
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S_6=-105
\end{cases}$

$\bf -105=a_1\left( \cfrac{1-(-2)^6}{1-(-2)} \right)\implies -105=a_1\left( \cfrac{1-(64)}{1+2} \right)
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\\\\\\
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2 years ago

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igor_vitrenko [27]

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