How to divide 32 ÷ 4168 the long way

Z4=289 there should be 4 answers total 2 whole numbers and either 2square root or imaginary number answers

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.

Over which interval is the graph of f(x) = x2 + 5x + 6 increasing?