After the expression (x^8)^3/4 is simplified as much as possible, x is raised to what exponent?

Ineeeeed this is due tomorrow and i dont know the answer can you find all the exponents

Monthly water bills for a city have a mean of $108.43 and a standard deviation of $32.09. find the probability that a randomly selected bill will have an amount greater than $155, which the city believes might indicate that someone is wasting water. would a bill that size be considered unusual?

Ill mark the brainliest if you me with the these three questions 7,8,9