Which shows 53^2-47^2 being evaluated using the difference of square method

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?

In the diagram, gef and hef are congruent. what is the value of x

Find the unit rate for: 75% high-fiber chimp food to 25% high -protein chimp food.