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you have a $20 bill. you and your friend ordered two roast beef wraps, one soup, one fries, and two coffees. if the tax is 5% and the tip is 15%, what change did you receive back from the $20?

the cost of the meal added up is 14.55 how do i add the tax and tip?

The total ticket sales for a high school basketball game were $2,260. the ticket price for students were $2.25 less than the adult ticket price. the number of adult tickets sold was 230, and the number of student tickets sold was 180. what was the price of an adult ticket?

James was playing a game with his friends. he won 35 points. then he lost 15, lost 40 and won 55. how did he come out

Afactory makes propeller drive shafts for ships. a quality assurance engineer at the factory needs to estimate the true mean length of the shafts. she randomly selects four drive shafts made at the factory, measures their lengths, and finds their sample mean to be 1000 mm. the lengths are known to follow a normal distribution whose standard deviation is 2 mm. calculate a 95% confidence interval for the true mean length of the shafts. input your answers for the margin of error, lower bound, and upper bound.