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