The diameter of the sun is 1.391 million kilometers. represent this number in scientific numbers.

The diameter of a circular chip is doubled to use in a new board game. the area of the new chip will be

Find the midpoint m of z1=(8+5i) and z2=(12+3i)

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.