The expression 14.99n + 4.99 represents the cost of n CDs. Find the total cost for 3 CDs. Please answer this algebra question. My answer was 49.96 but my homework says it is wrong.

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.

Two numbers have a sum of -19. one number is x. what expression represents the other number?

Point a (7,3) is translated to a'(16,-9). which rule describes the translation?