Asporting goods store bought a ski set at a cost of $291. later, the ski set was marked down by 20% from its selling price and then marked down another 30%. the total markdown is the greatest possible markdown without the store loosing money. find the original selling 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