converting recursive & explicit forms of arithmetic sequences

Question

complete the recursive formula of f(n) f(n)=93+4(n-1)

Answer 1

nth term = =a1+d(n-1) d=4=common difference

an =93+4(n-1) =93+4n-4= 89+4n

f(n)= 89+4n

a1=93

a2=97

a3=101

...

93,97,101,105,109,...