4. [8 points] Assume that the demand function is given implicitly by p q - 3q = Inpq. Let r represent the revenue function, then what is a at p = V3? dr V3 3 (A) V3 V3 213 + 1 (B 213-1 + 13 (C) 2V3-1+3 (D) Revenue is not differentiable 5. [4 points] For the exponential function f (x) = 10(x, where x > 0 and x E R, which of the following statement describes it correctly? (A) As the x value becomes more positive, the slope of f (x) becomes more positive. (B) As the x value becomes more positive, the slope of f (x) gets closer to the value-. 10 (C) At the x value becomes more positive, the slope of f(x) becomes more negative. (D) f(x) is differentiable for all real numbers