Rectangle rect is rotated 360° about the y-axis. find the surface area and volume of the resulting solid of revolution. be sure to do the following: indicate the type of solid that was formed and its key dimensions. state all formulas. show all substitutions and work. use appropriate units in your answers

Ineed with number 6 , explain how to get 1978

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.

Acertain volume of water contains 100000 hydrogen atoms and 50,000 oxygen atoms how many hydrogen atoms are in a volume of water containing 4 million oxygen atoms