What is 0.00034 written in scientific notation?

Which best explains why this triangle is or is not a right triangle?

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 prime factorization of 23 ?me with this question