{(3, 9), (4, 8), (–7, 4), (0, 4), (2, 4), (3, 5), (–3, 8)}
a. yes, each x-value is paired with exactly one y-value.
b. no, there is a y-value paired with more than one x-value.
c. no, there are no negative y-values.
d. no, there is an x-value paired with more than one y-value.

Write two subtraction equations that are equivalent to 5 + 12 = 17.

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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?