Solve rational and radical equation.

Idon’t understand this.. will someone ? will mark brainliest along with 20 points.

Choose the point slope form of the equation below that represents the like that passes through the points (-6,4) and (2, 0)

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.