Solve the following equation 5(e + 6) = 75

Can someone me with the property questions for 12 13 and 14 plz

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.

The interior angles formed by the side of a hexagon have measures of them up to 720° what is the measure of angle a