Do on your own: 

	15.4 all core problems
	15.5 all core problems
	15.6 all core problems 


Hand in: 

	15.3 #66
	15.5 #37; also estimate the maximum error in your answer,
	          assuming the given formula for C is exact
		  (estimating the error in readig the graph is
		  part of the problem).
	15.6 #34