Suppose that the cost (in dollars) of producing x air conditioners is f(x) = 560 + 40x a. Find a formula for the inverse function f(x). Please show all steps. b. Check your work from part a by finding ((x)) and ((x)) Please show all steps. c. Compute the quantity f(760) and explain, in your own words, what this number means in this context. (Use the units and words like "cost" and "air conditioners")