In 1993 president clinton received an average of 25,000 letters per day if an average month has 30 days how many letters did he receive in one month

What is the absolute value of the complex number -4-sqrt2i

You deposit $5000 each year into an account earning 3% interest compounded annually. how much will you have in the account in 30 years?

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.