What is the value of n when 8n - 7 = 6n +5?

Need ! discuss how to convert the standard form of the equation of a circle to the general form. 50 points

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.

Ineed someone to me answer my question i have to have this done and knocked out