Hillview Elementary School has 3 sixth-grade classes of 22 students each. On a Friday, the entire 6th grade went on a field trip to the science museum. Some of the 6th graders were absent that day. If s represents the number of 6th grade students who were absent on that Friday, which of the following expressions shows how many 6th graders went to the science museum?

What does x = in this equation x+3+2x=x+5

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.

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