Sin 20 = cos a Find a
Please be sure to show your work.​

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?

Me complete this proof! prove that a quadrilateral is a square. me with the steps for this proof.

Select all of the following expressions that are equal to 2.5.