Question

13. Add the following using number line.
a) (9 +2)+7 = 9+ (2+7)
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Answer 1

Step-by-step explanation:

To add a positive number means that we move the point to the right of the number line.

Similarly, to add a negative number implies that we move the point to the left of the number line.

here is a diagram of a number with zero at the center, integers 1 to 7 on the right side, and integers -1 to -7 on the left side. there are notes under the number line that to add a positive number, you move some units to the right of the number line while to add a negative number means you move some units to the left of the number line.

Answer 2

Answer:

This is right answer 18 = 18 .