It represents the absence of a number
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The distance from zero on a number line is called the absolute value.
The answer is the magnitude (size) of the number.
zero is infact a number not a placeholder contrary to popular belief. many people may argue that zero is the bridge between the positives and the negatives upon the infinite number line. However Zero has a value just as any other number on the number line. zero has a value of zero. this is not an absess of value but the very much real value of zero. if a certain representation has a value on the number line it must therefore be a number. the socalled bridge between the positive and negative numbers is the line upon which all numbers of infinite value are settled.
Zero
No, not necessarily. A number line can start and end wherever you need it. But if you are including both positive and negative numbers, then there needs to be a position for zero.