A squirrel is on top of a tree that is 20 feet tall. The squirrel looks down at an acorn on the ground. It is looking down at an angle of depression of 45 degrees. How far is the acorn from the tree?

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.