Kareem cannot decide which of two washing machines to buy. The selling price of each is $520. The first is marked down by 50%. The second is marked down by 20% with an additional 30% off. Find the sale price of each washing machine. Use pencil and paper. Explain why Kareem
should buy the first washing machine rather than the second if the machines are the same except for
the selling price.

pl helppp me lol
I give brainliest

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.