Write a system of equations to describe the situation below, solve using elimination, and fill in the blanks. A realtor is decorating some homes for sale, putting a certain number of decorative pillows on each twin bed and a certain number on each queen bed. In one house, she decorated 2 twin beds and 4 queen beds and used a total of 44 pillows. At another house, she used 34 pillows to spruce up 4 twin beds and 2 queen beds. How many decorative pillows did the realtor arrange on each bed?

help.

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.