Ok there are three questions from my precal homework that i CANNOT figure out. its driving me nuts. Any help?
Suppose that the manufacturer of a gas clothes dryer has found that, when the unit price is p dollars, the revenue R (in dollars) is given by the equation below.
R(p) = -4p2 + 2480pDavid has available 550 yards of fencing and wishes to enclose a rectangular area.
What unit price for the dryer should be established to maximize revenue?
What is the maximum revenue?
(a) Express the area A
of the rectangle as a function of the width x
of the rectangle. A
(b) For what value of x
is the area largest? x
(c) What is the maximum area?
A farmer with 4000 meters of fencing wants to enclose a rectangular plot that borders on a river. If the farmer does not fence the side along the river, what is the largest area that can be enclosed?