WXYZ is an isosceles trapezoid. WY = 8x – 3 and ZX = 19. Find the value of x.

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?

If the wwight of a package is multiplied by 7/10 the result is 65.8 find the weight of the package

If cos(2x) = tan^2(y), show that cos(2y) = tan^2(x).