Find the exact value of cos 15º.

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?

Rectangle leg this 11feet and perimeter of 38feet what is the width of the rectangle in feet

Select the quadratic that has root x = 8 and x = -5