pre cal precalculus even odd value

Question

If f(x) = {x if x is even 

               2X if x is odd,    then what is the value of f(5) + f(6)?

Answer 1

           |  x  if x is even

f(x) = <

           | 2x  if x is odd

 

The notation f(5) really means f(x=5).  So just insert 5 wherever an x appears in the equation.

 

f(x=5) = 2(5) = 10 because x=5 is odd.

 

f(x=6) = 6 because x=6 is even.

 

f(5) + f(6) = ?