Help me little brother with his math please

Consider the linear function that is represented by the equation y= 4x+5

If wxyz is a square, which statements must be true? plz < 3

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)?