<em>It's a rational number because it can be represented by the integer of integer numbers. It's also a real number because rational numbers belong to the real set of numbers and the number doesn't contain an imaginary component (i).</em>
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<em>It's not a natural or whole number because it can't be used to count or order things.</em>
<em>It's not an integer because it can't eb written without using a fractional component.</em>
The answer is d (i.e. 51). the first 9 pages utilize 9 digits. the remaining 21 pages utilize two digits number. Therefore, 21*2=42 the total is 42+9=51
