The number represented by the arrow is 9 if each unit is represented by 1 option fourth is correct.
It is defined as the representation of the numbers on a straight line that goes infinitely on both sides.
The question is incomplete.
The complete question is in the picture, please refer to the attached picture.
We have a number line shown in the picture.
As we can see each unit is represented by 1.
So after 2 there will be 3 and after 4 there will be 5 and so on.
So after 8, there will be 9 which is represented by the arrow.
Thus, the number represented by the arrow is 9 if each unit is represented by 1 option fourth is correct.
Learn more about the number line here:
brainly.com/question/13189025
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