Write the addition or subtraction shown by the number line

Start at 4.

So far you have: 4

Now you go 7 units left. Going left means a subtraction. Going 7 units left means subtracting 7.

So far you have: 4 - 7

The result is -3.

The subtraction is:

4 - 7 = -3

no, x cannot be the same number. in all of them, x is 1. for one input there is another output. g is not a function

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