Which expression can be used to determine the average rate of change in f(x) over the interval mc001-1.jpg
a f(9 – 2)b f(9) – f(2)
c f(9-2) / 9-2
d f(9) - f(2) / 9 - 2

Jessica is organizing a guided tour of the rain forest. the average profit per person that the touring company makes is given by the rational expression 18x+35/x, where x is the number of people going on the tour. what does the numerator of this rational expression represents?