4
Fibanocci numbers are each the sum of the 2 previous numbers, i.e. 1,1,2,3,5,8
Thus 4 is the first one missing
By modern definition, the above response is incorrect - 0 (zero) is both positive (it is defined as such) and not in the Fibonacci set. This answer is given based on a slight assumption, there cannot be a "first number" on a number line. The lowest number that is positive and not within the set of Fibonacci numbers (as inferred as the true meaning of your question) is zero.
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1 is the first positive number on the number line.
no, If the original number is positive, it adds the absolute value (always a positive) to the first number thus doubling it
You can do this by inspection. If the second number is smaller than the first, their difference is positive. If the second number is greater than the first, then their difference is negative. If the second number is the same as the first number, then their difference is zero.
4
Not necessarily. A negative number plus a positive number can be negative, zero or positive.