Need help with number 10 thanks

Mathematics

2 answers:

vova2212 [387]3 years ago

4 0

It is obviously the third one because c is the third letter in the alphabet

garri49 [273]3 years ago

3 0

The answer is C.
Hope this helps :)

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$\bf n^{th}\textit{ term of a geometric sequence}\\\\
a_n=a_1\cdot r^{n-1}\qquad 
\begin{cases}
n=n^{th}\ term\\
a_1=\textit{first term's value}\\
r=\textit{common ratio}\\
----------\\
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\end{cases}
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\\\\\\
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\\\\\\
\boxed{5=n}\\\\$

$\bf -------------------------------\\\\
\qquad \qquad \textit{sum of a finite geometric sequence}\\\\
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n=n^{th}\ term\\
a_1=\textit{first term's value}\\
r=\textit{common ratio}\\
----------\\
a_1=4\\
r=3\\
n=5
\end{cases}
\\\\\\
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