After a long series of true/false questions from my calculus book, I'm left with three I don't really understand. Anyone care to explain them to me? A) If f and g are differentiable increasing functions and g(x) is never equal to 0, then the function h(x) = f(x)/g(x) is also a differentiable increasing function. B) If a function is period with period c, then so is its derivative. C) If C(q) represents the cost of producing a quantity q of good, then C'(0) represents the fixed costs.