1. The problem statement, all variables and given/known data Suppose that the utility functions u(x,y) are related to v(x,y) = f(u(x,y)). In each case below, select "Yes" if the function f is an increasing, monotonic transformation and "No" if it is not. 2. Relevant equations A differentiable equation f(u) is an increasing function of u if its derivative is positive. 3. The attempt at a solution f(u) = 3.141592u (YES) f(u) = 5000-23u (YES) f(u) = u-100000 (YES) f(u) = log(base 10)u (NO) f(u) = -e^-u (NO) f(u) = 1/u (NO) f(u) = -1/u (YES) My answers are in parenthesis. Are they right? If not, can you explain briefly why?