Decide whether n = 9 is a solution to
the equation 2+n=7. Write yes or no

Find the value of the cosine for angle a

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?

Which of the following points is collinear with (-2,1) and (0,3)