Please help with number 1 and 2

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 missing step in this proof ?

Find the area of the regular hexagon if a side is 20 cm.