Craig bought a 3 foot long baguette and then made 4 equally sized sandwiches with it. what portion of the baguette was used for each sandwich?

Question and answers are in the attached picture. you so much in advance.

If x is 6, then 7x= a. 13 b. 42 c. 42x d. 76

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.