A computer store buys a computer system at a cost of $357.60. The selling price was first at $596, but then the store advertised a 40% markdown on the system. Answer parts a and b.
a. Find the current sale price

Afarmer has a large field that is x feet in length. he wants to fence in a rectangular section in the middle of the field , leaving a length of 100 feet of open field behind each end of the fenced rectangle. he also wants the width of the fenced-in space to be 100 feet less than its length. find the expressions to represent the length and width of the fenced section of the field