Compare the two expressions using < ,> , or =. for each, explain how you can determine the answer without calculating. a) 100 times 8 o 25 times (4 times 8) b) 48 times 12 o 60 twelves - 13 twelves c) 24 times 36 o 18 twenty-fours, tripled

What is the value of x when x + 7 = 21?

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.

An object is translated by (x + 4, y - 2). if one point in the image has the coordinates (5, -3), what would be the coordinates of its pre-image? (9, -5) (1, -5) (9, -1) (1, -1)