Describe and justify the methods you used to solve the quadratic equations in parts A and B.

Acredit card advertises an annual interest rate of 23%. what is the equivalent monthly interest rate?

At $1.32 million, they closed last month percent above what they paid in 2007." how much did they pay in 2007?

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.