Simplify the radical expression -21√27x^9

Evaluate the integral. (sec2(t) i t(t2 1)8 j t7 ln(t) k) dt

Add the two expressions 3.8b - 7 and 2.9b + 9 enter your answer in simplified form

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?