Answer:
3f +11
Step-by-step explanation:
[tex](f + 3) + (2f + 8)[/tex]
Open the bracket
[tex]f + 3 + 2f + 8[/tex]
Group like terms
[tex]f + 2f + 3 + 8 \\ [/tex]
Simplify
[tex]3f + 11[/tex]
it should be 3f+11
