Solve the problem..

Answer:
[tex] f(3) = 21 [/tex]
Step-by-step explanation:
To find f(3) for the function [tex] f(x) = 5x + 6 [/tex], simply plug in the value of x into the equation.
Thus:
[tex] f(3) = 5(3) + 6 [/tex]
[tex] f(3) = 15 + 6 [/tex]
[tex] f(3) = 21 [/tex]