Corey needs 24 boards that are 47 1/2 inches long. how many feet of boards should he buy? explain.

How do i do this using elimination 2x+3y=12 x-y=6

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Assume that adults have iq scores that are normally distributed with a mean of mu equals 100 and a standard deviation sigma equals 20. find the probability that a randomly selected adult has an iq between 80 and 120.assume that adults have iq scores that are normally distributed with a mean of mu equals 100 and a standard deviation sigma equals 20. find the probability that a randomly selected adult has an iq between 80 and 120.