Astronomers classified the planets into six sizes with five atmosphere types and four average temperature ranges. How many different planet
types are there?
(Open ended math question)

2x+3y=12 x-y=6 solve the following system equations

If (x-2) 2= 49, then x could be a. -9 b. -7 c.- 2 d. 5 e.9

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.