PLS HELP TAKING TEST which one is equivalent to (8^-a)^b

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?

The graph shows the amount of money noah earned based on the number of lawns he cut. which list shows the dependent quantities in the graph?

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