Istuck with this one.
simplify expression 3ab² −5a²b+ (−3a²b)−4ab²

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?

Find the dimensions of the circle. area = 64π in.² r= in.

Can someone me with this graph problem by the way i need to know the answers by today since this assignment is due ! !