Show that if cosine as constructible then cos a is constructible

Given a(-12,5) and b(12,29) find the point that divides the line segment ab three-eighths of the way from a to b

Which graph of a hyperbola represents the equation 16x^2-y^2=16

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)?