Please Help?? Half Angle & Reduction Identities Will mark brainliest for correct answer!!

How to determine whether two known pairs of points are on the same line.

Rockwell hardness of pins of a certain type is known to have a mean value of 50 and a standard deviation of 1.1. (round your answers to four decimal places.) (a) if the distribution is normal, what is the probability that the sample mean hardness for a random sample of 8 pins is at least 51?

James was playing a game with his friends. he won 35 points. then he lost 15, lost 40 and won 55. how did he come out