This property says you can rewrite 3x (4 + 5) as (3x
4) + (3x5)

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.

David leaves his house to go to school. he walks 200 meters west and 300 meters north. how far is david from his original starting point?

Find the vertex for the parabola given by the function ƒ(x) = −3x2 − 6x.