Need help with question 40

In Exercises 39-44, determine the values of x, if any, at which each function is discontinuous. At each number where fis discontinuous, state the condition(s) for continuity that are violated. 39. f ( x ) = 2x - 4 ifx 50 if x > 0 5 X 5 -5 -10 40. 10 f(x) = x +1 ifx #0 if x = 0 -4-3-2-1 12 3 4