### Instruction: What is $8-4 \div 2-1$?### Response: I know that order of operations tells me to do the division before the subtraction, so I will start with $4 \div 2$.
That gives me $2$, so I can rewrite the expression as $8-2-1$.
Now I only have subtraction left, so I can do it from left to right.
That gives me $6-1$, which is $5$.
So the final answer is $5$.