In september, the fourth digit of the code number is 2 more than the fourth of the digit code number based on the prime factors of 225. the prime factors of what number were used for the code in september

Simplify (a/b - b/a) times (a - a^2/a+b) a - a^2/a=b is a mixed number

With these: 18/36 = 1/? missing number change 1 5/8 to improper fraction. change 19/5 to a mixed number.

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.