Question

What is the value of f(7) for the function f(x) = 4x + 3?

Answer 1

f(x) = 4x + 3

f(7) = 4*7 + 3
f(7) = 31

Answer 2

31.  
replace x in the equation with 7
F(7)=4(7)+3
4(7)=28 so,
F(7)=28+3
which equals F(7)=31.  
the answer is 31