A teacher measured the mass of three textbooks. The mass of the math book is 9/10 kilogram. The mass of the science book is 3/10 kilograms less than the mass of the math book. The mass of the reading book is 2/10 kilograms greater than the mass of the science book. what is the mass of the reading book?

What is the least common multiple of 6 and 17?

D(5, 7). e(4,3), and f(8, 2) form the vertices of a triangle. what is mzdef? oa. 30° ob. 45° oc. 60° od 90°

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.