Michael just finished a great meal in a restaurant in wisconsin. the sales tax in wisconsin 5%, percent, and it is customary to leave a tip of 15%, percent for the waiter. the tip amount is calculated on the price of the meal before the tax is applied. sales tax is not calculated on tips.
if michael left $18 on the table to cover his meal, tax, and tip, what was the price of his meal before tax and tip?

An automobile assembly line operation has a scheduled mean completion time, μ, of 12 minutes. the standard deviation of completion times is 1.6 minutes. it is claimed that, under new management, the mean completion time has decreased. to test this claim, a random sample of 33 completion times under new management was taken. the sample had a mean of 11.2 minutes. assume that the population is normally distributed. can we support, at the 0.05 level of significance, the claim that the mean completion time has decreased under new management? assume that the standard deviation of completion times has not changed.

An airplane travels at an unknown elevation before it descends 3 miles to an elevation of 15 miles. find the elevation of the plane before its descen.

Frank has a devised a formula for his catering business that calculates the number of meatballs he needs to prepare. the formula is m=4a+2c, where c=number of children; m=number of meatballs; a=number of adults. how many meatballs are required for a party of 10 adults and 5 children?