Answer:
7/9
Explanation:
There are a total of 18 coins in Sarah's change purse, and 4 of them are quarters. Therefore, the probability of her pulling out a coin that is not a quarter is equal to (18-4)/18, or 14/18. Simplifying this fraction, we get 7/9. Therefore, the probability of Sarah pulling out a coin that is not a quarter is 7/9.