Identify the like terms in this expression: 3xy + 2x – 7xy + 4x2 a. 3xy and –7xy b. there are no like terms in this expression. c. 3xy, 7xy, and 2x d. 2x and 4x2

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.

Find the nonpermissible replacement for binthis expression. b2/5b +5

These tables represent a quadratic function with a vertex at (0, -1). what is the average rate of change for the interval from x = 9 to x = 10?