On friday , 2 classes went on a feild trip. if the 3 other classes are left at the school, and there are 20 students per class, how many students are left at the school?

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 equation can be simplified to find the inverse of y = 2x2^2

Find the area of the shaded region.