9. Let P = {1,3,5,7) Q = {3, 7, 9, 11} R = {1, 5, 8, 11}, then verify the following.
(a) PUQ = QUP
(b) (P UQ) UR = PU (QUR)
(c) PnQ = QnP

Alawn mower manufacturer incurs a total of 34,816 in overhead costs and 388 per lawn mower in production costs. how many lawn mowers were manufactured if the average cost of productions is 660

You’re repairing a large rectangular aquarium. the final step is to cover the glass with a protective film. the front and back of the aquarium measure 4 meters by 2 meters, and the sides of the aquarium measure 3 meters by 2 meters. how many square meters of protective film do you need? ( )

Acabinmaker buys 3.5 liters of oat varnish the varnish cost $4.95 per liter what is the total cost of 3.5 liters