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In the coordinate plane, what is the length of the line segment that connects points at (0, −1) and (−7, −2) ?

Enter your answer in the box. Round to the nearest hundredth.

units

Which answer is it for it to be simplified completely?

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.

How do i multiply two digit numbers