Respostas

2013-06-18T01:29:07-03:00

a_{n}=a_{1}+(n-1)r \\\\\begin{cases}a_{n}=?\\a_{1}=5\\n=15\\r=10-5=5\end{cases}\\\\a_{15}=5+(15-1)5\\a_{15}=5+75-5\\a_{15}=75

 

Quaisquer dúvida, por favor, me avise no chat.