What is the value of ..

If f(x)=2x-6 and g(x)=3x+9, find (f-g)(x)

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?

If your teacher tells you to do questions 6 through 19 in your math book for homework, how many questions is that