Afinancial planner wants to invest $8000, some in stocks earning 15% annually and the rest in bonds earning 6% annually. how much should be invested at each rate to get a return of $930 annually from the two investments? (hint: let x = the amount, in dollars, invested at 15%, and let y = the amount, in dollars, invested at 6%.)

The john deere company has found that revenue, in dollars, from sales of heavy-duty tractors is a function of the unit price p, in dollars, that it charges. if therevenue r is r(p)= -1/2p^2 +1900pa)how much revenue will the company generate if they sell 700 tractors? b) how many tractors does the company want to sell to maximize the revenue?