Combine positive numbers: Combine the positive numbers in the expression. We have 1, 8, and 10, which are all positive. Adding these together gives us 1+8+10=19.
Subtract negative number: Subtract the negative number from the result of Step 1. We have 19 from the previous step and we need to subtract 8 from it. So, 19−8=11.
Check for errors: Check for any mathematical errors in the previous steps. The addition and subtraction were performed correctly, and no errors were made.