Can you conclude that this parallelogram is a rectangle? Explain. No; the diagonals may not be congruent.
Yes; the diagonals bisect two angles of the parallelogram.
Yes; there are four right angles given.
Yes; the diagonals are perpendicular.

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?