Question

Please help me with this.

Answer 1

`a_(n) = +(n-1)d`

We are given the first term and the common difference.

So,


`a_(1)=-10 \\ \\ d=5`

Using these values in the given equation, we get:


`a_(n) =-10+(n-1)*5 \\ \\ a_(n) = -10 + 5n - 5 \\ \\ a_(n) = 5n -15`

So, option C gives the correct answer.