Final answer:
The expression -6 - (-8) simplifies to -6 + 8, which equals 2. The best number line for this operation is B: -10 -8 -6 -4 -2 0 2 4 6 8 10.
Step-by-step explanation:
You are trying to solve the expression -6 - (-8). When you subtract a negative number, it's the same as adding its positive counterpart. So the expression becomes -6 + 8. When you add these two numbers, you start at -6 on the number line and move 8 units to the right, ending up at 2.
The correct number line to use for this operation is the one with evenly spaced numbers that includes both -6 and 2 within the range. Number line B, with increments from -10 to 10, would best represent this. Number line B is written as follows: -10 -8 -6 -4 -2 0 2 4 6 8 10.