Which of the following is the reference angle for an angle that measures 222 degrees ? 1.22
2.48
3.64
4.42

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?

Angles r and s are complementary. the measure of angle r is 31 degrees. which equation can be used to find angle s?

Simplify this expression. 8x 16(x + y)