Question

F (3) if f (x) = 2x + 4

Answer 1

If f(x) = 2x + 4

then f(cow) = 2(cow) + 4

and f(1 quart) = 2(1 quart) + 4

and f(3) = 2(3) + 4

= 6 + 4

= 10

Answer 2

you have to replace x with 3
f (3)=2*3+4=6+4=10