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Which expression do you get when you eliminate the negative exponents of 4a^2 b^216a^-3 b

Gabrielle's age is two times mikhail's age. the sum of their ages is 84. what is mikhail's age?

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.