What is the answer to the expression 30 minus 9?

To find the result of the expression 30 minus 9, you simply need to perform the subtraction operation. Start with the number 30, which represents the whole amount you have, and then subtract 9 from it. This means you are taking away 9 units from the total.

When you carry out the calculation, you perform the following steps:

1. Take 30.

2. Subtract 9 from it.

30 - 9 equals 21.

Therefore, the answer to the expression is indeed 21. This is the correct result of the mathematical operation, showing that when you remove 9 from 30, you are left with 21.