The field metabolic rate (FMR), or the total energy expenditure per day in excess of growth, can be calculated for pronghorn fawns using Nagy’s formula,

F(x) = 0.774 + 0.727 log x,

where x is the mass (in grams) of the fawn and F(x) is the energy expenditure (in kJ/day).

(a) Determine the total energy expenditure per day in excess of growth for a pronghorn fawn that weighs 25,000 g.
(b) Find F′(25,000) and interpret the result.
(c) Graph the function on [5000, 30,000] by [3, 5].