ASAP in 4 math question! Please answer! Someone answered but its wrong. Will mark brainliest! Please answer! NEEDS TO BE CORRECT

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.

Write the equation in logarithmic form 8^x=64

With number 11 ( show how you got the answer)