Answer:
13
Step-by-step explanation:
3n+1
Let n= 4
3(4)+1
12+1
[tex]{ \tt{f(n) = 3n + 1}} [/tex]
» When n is 4, f(n) is f(4);
[tex]{ \tt{f(4) = 3(4) + 1}} \\ { \tt{f(4) = 12 + 1}} \\ { \underline{ \tt{ \: f(4) = 13 \: }}}[/tex]
