2 years ago

Need help finding the measurement for x

Mathematics

1 answer:

Nataliya [291]2 years ago

6 0

Answer:

x=34

Step-by-step explanation:

x+(x+12)+(100) = 180

2x+112=180

x=68

x=34

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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}\\
----------\\
a_1=9\\
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a_n=-187
\end{cases}
\\\\\\
-187=9+(n-1)(-7)\implies -187=9-7n+7
\\\\\\
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