I need your help smart kids

If the wwight of a package is multiplied by 7/10 the result is 65.8 find the weight of the package

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 axis of symmetry of the function f(x)=-(x+ 9)(x-21)