A high school is expanding its football field in order to allow other sports to be played on the field. The school will also be installing artificial turf, which costs $4.75 per square foot, on the entire field. The current football field is 360 feet long and 160 feet wide. The number of feet, , by which the length

of the field will be expanded is twice the number of feet by which the width of the field will be expanded. Which function f(x) represents the cost of

artificial turf for the entire field?