question 18 a b c d

18. marginal Profit: the publisher ora recently released nonfiction book expects release, the monthly profit can be approximated w/the model P(t)=900+600t - 30tQ tar10 where is in thousands of dollars and tis in months from the time of release. a. Find marginal profit eqri b. Specify and interpret the expected marginal profit Smonths after release c. Specity and interpret expected margina profit idmonths after release. offer a math argument to demonstrate that from month 2 after release the month profit realized from the sales of the book! decreases steadily