Answer:
f (5)=3 (5)+7
f (5)=15+7
f (5)=22
22
Step-by-step explanation:
[tex]\begin{array}{rcl}f(x) & = &3x + 7\\& = & 3 \times 5 + 7\\ & = & 15 + 7\\& = & \mathbf{22}\\\end{array}[/tex]
