3 years ago

Pls help wit this question? ≅ω≅

Mathematics

1 answer:

Jlenok [28]3 years ago

6 0

20/60 or 1/3

Hope this helps:)

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Step-by-step explanation: I hoped this helped in some way or form.

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timofeeve [1]

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3 years ago

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$\bf n^{th}\textit{ term of an arithmetic sequence}\\\\
a_n=a_1+(n-1)d\qquad 
\begin{cases}
n=n^{th}\ term\\
a_1=\textit{first term's value}\\
d=\textit{common difference}\\
----------\\
n=12\\
d=-10\\
a_{12}=13
\end{cases}
\\\\\\
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\\\\\\
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$\bf \\\\
-------------------------------\\\\
\textit{sum of a finite arithmetic sequence}\\\\
S_n=\cfrac{n}{2}(a_1+a_n)\qquad 
\begin{cases}
n=n^{th}\ term\\
a_1=\textit{first term's value}\\
a_n=\textit{value of the }n^{th}\ term\\
------------\\
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\end{cases}
\\\\\\
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and surely you know how much that is.

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