5times a number is less than 2 times that same number minus 9, what must be the value of the number?

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?

How do you solve a question like this?

Given: pqrs is a parallelogram prove: pr and qs bisect each other at t