Question: Area If 100 feet of fence is to be used to enclose a rectangular yard, then the resulting area of the fenced yard is given by
A = x(50 - x)
where x is the width of the rectangle.
(a) Is A a function of x?
(b) If A = A(x), find A(2) and A(30).
(c) What restrictions must be placed on x (the domain) so that the problem makes physical sense?