Factorise: 30x^5+15x²y²+xy​

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?

Which number line correctly shows 0.8 + 0.3?

At a book fair, joe bought 24 books at 3 for $5 and had $2 left. how much money did he have at first?