Ms. Mbariket needs to have her car repaired but does not want to spend more than $375 for the repairs. The mechanic says that the part needed
for the repair will cost $100 and the labor will cost an additional $40 per
hour. Which inequality below represents the greatest number of hours
the mechanic can work without exceeding Ms. Mbariket's budget?
40 + 100x < 375
O 100 + 402 < 375
O 140x < 375
O 100 + 40.2 > 375

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.