Question

an= 27+(n-1)(5) find a_8

Answer 1

we have the following formula

$a_n=27+(n-1)\cdot5$

In order to find the result when n=8, we must substite this value in our formula. It yields,

$a_8=27+(8-1)\cdot5$

then, we have

$\begin{gathered} a_8=27+7\cdot5 \\ a_8=27+35 \\ a_8=62 \end{gathered}$

so, the answer is 62