125-6n where n is an integer we start at n=0, wait, we want to start at n=1 because first term, not zeroeth term
so 125-6(n-1) or 125+6-6n or 131-6n is da equation make a patter f(x)=131-6n where the domain is all natural numbers (1,2,3,4,5, etc) first term is f(1)=125
