Ajar contains 0.75 liter of blackberry juice and 0.60 liter of blueberry juice. patrick poured 0. 25 liter of guava juice into the jar. he then drink 0. 20 liters of the mixture. write an expression to represent the total amount of juice left in the jar? identify which property is used in each step to simplify the expression?

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.