Please help me with this question

The diameter of a circular chip is doubled to use in a new board game. the area of the new chip will be

Issof claims that the scale factor is 1/2. which statement about his claim is correct

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?