23/36 + 5/12 write answer in a mixed number and in simplest form

Acircle has the equation (x-2)^2 +y^2 =5. what are the coordinates of the circle's center?

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?

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