64% is what of 75 tiles

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?

The interior angles formed by the side of a hexagon have measures of them up to 720° what is the measure of angle a

Rationalize the denominator- 12x/√x-10