What are all the numbers between 300 and 400 with fewer than 2 ones

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 square pyramid has a volume of 441 cubic inches. what is the value of x? 1/7x is the height x is the base

You deposit $5000 each year into an account earning 3% interest compounded annually. how much will you have in the account in 30 years?