It does not have to. Default settings can do that to avoid cluttering up the area or having overlapping numbers. It could also depend on the major units that are used for the axis.
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Because if it has every single number (ie. 0-20) when it doesn't need to have ALL of them. So it just has every second one! To make it a better and smaller (and a bit more accurate) graph!
No but every integer is a rational number and numbers that can be expressed as fractions are also rational numbers
No. Every rational number is not a whole number but every whole number is a rational number. Rational numbers include integers, natural or counting numbers, repeating and terminating decimals and fractions, and whole numbers.
The set of real numbers is defined as the union of all rational and irrational numbers. Thus, the irrational numbers are a subset of the real numbers. Therefore, BY DEFINITION, every irrational number is a real number.
Every whole number is rational and an integer. But the "natural" numbers are definedas the counting numbers, so the negative whole numbers wouldn't qualify.No and yes: it is not a natural number but it is a rational number.