Numbers are infinitely dense so there is no number that can be said to be after 4.99: whatever that number is, the average of 4.99 and that number will always come between the two.
In terms of the marking on the number line, the answer depends on the graduation scale. Most likely, it is 5.00, but it could be 4.991, 4.9901 etc.
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499 is a whole number.
1/2
499 ÷ 500 × 100 = 99.8
A prime number has only 2 factors which are 1 and itself. Composite numbers are everything else except 1 and 0. 1 and 0 are neither prime, nor composite. 499 is prime.
5.6 - 9.2 = -3.6, whether on a number line or anywhere else. You seem to be unaware of the fact that you could have obtained the answer much more easily and quickly by using the calculator that comes as part of your computer.