Someone please help asap

Which expression is equivalent to 2x^2+7x+4?

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 absolute value of the complex number -4-sqrt2i