Can someone plz help me on this thank you and please stop giving me links

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?

Rewrite the following quadratic functions in intercept or factored form. show your work. f(x) = 3x^2 - 12

Given δjkl : δxyz, find x. a)10 b)12 c)16 d)20