An architect plans to outline a rectangular region with a fence and some shrubs. The fence costs 10 dollars per foot and will be placed along the north side as shown. The shrubs cost 25 dollars per foot and will be placed along the other three sides as shown. shrubs (a) Write a formula for the total cost of the fence and shrubs in terms of x and y. C = (in dollars) (b) If the rectangular region has an area of 200 square feet, express the total cost of the fence and shrubs in terms of x only. C(x) = (in dollars)