1. Consider the subtraction expression 9 + (–10) on the number line shown. Explain how you would evaluate the expression on the
number line. A. Begin at 10 and move 9 units to the right
B. Begin at 9 and move 10 units to the left
C. Begin at 10 and move 9 units to the left
D. Begin at 9 and move 10 units to the right
The answer is B: Begin at 9 and move 10 units to the left.
Step-by-step explanation:
If you move to the left on a number line, you are subtracting. If you move to the right, you are adding. If you add -10 to a number, you are, in other words, subtracting 10 from the number.
