To start, because Alice starts out with 24.60, your starting number would be 24.60. Then, because she spends 8.25 dollars, you would then subtract this amount from Alice's original starting amount, 24.60. When you subtract, you should get 16.35. However, Alice then earns another $11.50, meaning you will add 11.25 to 16.35. This will result in $27.85 means that Alice does not have $30. This answers the first question. Then, the problem asks how much is Alice under or over $30. Because Alice is under $30, to find the amount of money she is under, you would perform 30-27.85 which would get you to the answer that Alice is $2.15 under 30 dollars.
The opposite of prime numbers are composite numbers. A composite number is a positive natural l number that has at least one positive divisor other than one or itself. The number 1 is not a prime number by definition - it has only one divisor.
