A Norman window has the shape of a rectangle surmounted by a semicircle. If the perimeter of the window is 8 ft, express the area A of the window as a function of the width x of the window.

You work for a landscape company that just got a contract to re-mulch a park. the area that needs mulching is 30 feet by 60 feet. they want a 3 inch layer of much on the area. the company has bags of mulch that cover 2 cubic yards that cost $4.00 per bag. how much will it cost the consumer just in materials to re-mulch the area (round to the nearest dollar)?