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.