Glen is looking into buying a piece of land. he estimates that the land measures 100 yd by 850 yd. the land is actually 140 yd by 940 yd. what is the percent error in the estimated area of the land?
a. 35.4%
b. 17.7%
c. 64.6%
d. 32.3%

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?