Find the standard form of the equation of the parabola with a focus at (0, -9) and a directrix y = 9. y = negative one divided by ninex2
y2 = -36x
y = negative one divided by thirty sixx2
y2 = -9x

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)?