Determine the solution for the system of equations below. 5x - 5y = 20
-2x - 2y = -4

infinitely many solutions
(2, -2)
(-2, 2)
no solution

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?

Can anyone me with 32,33,36,37,and 40.

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