Suppose that c(x)= (7x^3) - (84x^2) + (22,000x) is the cost of manufacturing x items. find a production level that will minimise the average cost of making x items. at this level, the average cost of making x items is how much?

Sam is a waiter at a local restaurant where he earns wages of $5 per hour sam figures that he also eams about $3 in tips for each person he serves sam works 6 hours on a particular day. if n represents the number of people sam serves that day, which of the following functions could sam use to figure ehis total earings for the do o a. en) = 30 o b. en) = 5n+ 18