Help me out with this question

Simply 8x squared + 5(7x squared- x) - 2x =

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 f(x)=-x^2+6x-1 and g(x)=3x^2-4x-1,find(f+g)(x)