## GMAT Practice Question Set #19 (Question 55-57)

Problem Solving Question #56: Function Constraints
 Time 0 0 : 0 0 : 0 0
 Among the functions given below, which one satisfies the equation f(x + y) = f(x) + f(y) for all positive numbers x and y? (A) f(x) = -2x (B) f(x) = 2/x (C) f(x) = sqrt(x) (D) f(x) = x + 1 (E) f(x) = x^2
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