Question

I know the nth term is easy but i can't get this right

Answer 1

Explanation:

`a_n=a_1+(n-1)d` where
`a_1` is the first term,
`d` is difference between terms.

a)
`a_n=12+(n-1)(-2)=12-2(n-1)=14-2n`

b)
`a_n=25+(n-1)(-5)=25-5(n-1)=30-5n`