The revenue is the amount of money the business earns from the sale of goods or services. An online business called Muffins A-Plenty started on January 1 of a recent. The lines in the graph represent the cost function and the revenue function of the first six months that Muffins A-plenty has been in operation.

Evaluate the expression for the given value of the variable 7a - 4a for a =8

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.

You have 12 balloons to blow up for your birthday party. you blow up 1/3, and your friend blows up 5 of them. what fraction of the baloons still need blowing up