ronnie wants to buy an autographed peyton manning jersey. the jersey cost $600. He has saved all his birthday money and has $250 already. he cuts grass and makes $50 for every yard that he mows in a big subdividion. write the equation in the slope intercept form to model this situation

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.