SALES A company estimates that when x thousand dollars are spent on the marketing of a cer...

SALES A company estimates that when x thousand dollars are spent on the marketing of a certain product, Q(x) units of the product will be sold, where

for 10 ≤ x ≤ 40. Sketch the graph of Q(x).Where does the graph have an inflection point? What is the significance of the marketing expenditure that corresponds to this point?