To solve this problem, we'll follow these steps:
- Step 1: Evaluate the inner expression 6−13
- Step 2: Substitute the result from Step 1 into 21−result from Step 1
Now, let's work through each step:
Step 1: Calculate 6−13. In this calculation, we subtract 13 from 6. The result is −7, because when subtracting a larger number from a smaller one, the result is negative.
Step 2: Substitute −7 into the outer expression 21−(−7). Since subtracting a negative is equivalent to adding the positive opposite, this simplifies to 21+7.
Now, compute 21+7, which equals 28.
Therefore, the solution to the problem is 28.