There are 13 animals in the barn. Some are chickens and some are pigs. There are 40 legs in all. How many of each animal is there. Set up a system of equation and solve

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.

Which of the following is closest to 32.9 x 7.5? a: 232 b: 259 c: 220 d: 265

Which is the graph of the linear equation x – 2y = 6?