A spinner has 4 different colors of equal size: red, blue, yellow, and white. If you spin the spinner 2 times, how many different color combinations can you get?

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 are two numbers that have a sum of 15?

Which linear function represents the line given by the point-slope equation y + 1 = –3(x – 5)?