Which compound inequality has no solution? x ≤ –2 and 2x ≥ 6
x ≤ –1 and 5x ≤ 5
x ≤ –1 and 3x ≥ –3
x ≤ –2 and 4x ≤ –8

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.

What number is 7 units left of -15?

Which ordered pair is a solution of the equation? 2x+3y=10