Which two expressions aré equivalent for any valué of y? a. 3(3y+3) and 6y+6 b. 3(3y+3) and 9y+6 c. 9(y+3) and 12+9y d. 9(y+3) and 27+9y

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.