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Mamont248 [21]
3 years ago
8

A | 12300| 24620| 35711| 102345| 98705a×3 a×9​

Mathematics
1 answer:
madam [21]3 years ago
7 0

Answer:

what is this ?

Step-by-step explanation:

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Find the sum of the first 30 terms of the sequence below an=3n+2
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First off, let's find the 1st term's value, and the 30th term's value,

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-------------------------------\\\\
~~~~~~~\textit{ Sum of an arithmetic sequence}\\\\
S_n=\cfrac{n(a1+an)}{2}~ 
\begin{cases}
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a1=\textit{first term's value}\\
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a1=5\\
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n=30
\end{cases} \implies S_{30}=\cfrac{30(5+92)}{2}
\\\\\\
S_{30}=15(97)
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