What is the first step in solving the equation by factoring?

A.

Divide both sides of the equation by –6.

B.

Divide both sides of the equation by x.

C.

Take the square root of both sides of the equation.

D.

Add 6x2 to both sides of the equation.

Please select the best answer from the choices provided

A

B

C

D

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.