What is x minus 5 equals negative 13

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?

What is the area of mnp? 40 m2 60 m2 68 m2 127.5 m2

Bring the fraction a/a-4 to a denominator of 16-a^2