Write an equivalent expression in standard
form and collect like terms.
2x - (x + 8) - 4

Acircle has the equation (x-2)^2 +y^2 =5. what are the coordinates of the circle's center?

What is the slope simplify your answer and write it as a proper fraction, improper fraction, or integer

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.