Lilburn Flooring Inc. needs to develop a simplified expression that can be used to determine the perimeter of any specified tile. Write an expression that represents the total perimeter of the tile, with border, and simplify.

Monthly water bills for a city have a mean of $108.43 and a standard deviation of $36.98. find the probability that a randomly selected bill will have an amount greater than $173, which the city believes might indicate that someone is wasting water. would a bill that size be considered unusual?