a tom tom hoop drum is made up of streched membranes, called heads, which are held tightly across a tubular shell. the drum has diameter 30 cm and height 30 cm. the shell of the drum is made of 5 layers of birch sheathing. a) how much sheating is needed to make the shell?

Saline iv fluid bags cost $64.20 for 24, 1000 ml bags from one supplier. a new supplier sells 500 ml bags for $2 each. the hospital uses about 10,000, 1000 ml bags each month. nurses report that about half of the bags are more than half full when they are discarded. if you are going to use only one supplier, which size bag provides the best deal, and how much will you save each month? compare the cost of the new supplier to the current one.