Contextual Methods The Riemann sums you evaluated in Problems 1 and 2 were approximations of net areas. For each function and context below, briefly interpret the net area under the function's graph. Make sure you include units of any quantity you mention. 7. 8. Ifthe function f(x) = 0.56 gives the rate of change in revenue as the number of thousands of units x increases (i.e., it is marginal revenue), then the net area under y over [1,61 is: If the function R(h) = 17 sin , gives the rate of snowfall (in cm/hour) as the time h in hours 6 increases, then the net area under y = [12,181 is: