3 points Eugene says that the following system of equations can be solved using
the substitution method. Abby says it can be solved using the elimination
method. Who do you think is correct? Explain your reasoning. *
2x + 2y = 10
x - y = 3

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.