Question 634664
This is a piece wise-defined function.
We cannot use 2 - x because the value of x 
must be less than 3 or = 3. 

So, we replace x with 3 in the expression
x + 2.

f(3) = x + 2 if x is less than 3 or equal to 3.

f(3) = 3 + 2

f(3) = 5

Done!