2,3
14,15
120,121
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As a number it is: 1,000,000,000,000
Basically, composite numbers are the non-prime numbers. Take a table of prime numbers, and look for any two prime numbers, one after the other, that have a difference greater than 2. Any numbers in between are consecutive composite numbers. For example, the next prime number after 13 is 17; that makes 14, 15, and 16 three consecutive non-primes, i.e., composite numbers.
Following Richard Dedekind's definitions of numbers, it looks like a whole lot of intervals on the number line, each one stretching to negative infinity.
5.7 rounded to the nearest whole number is 6
You simply take the number, say six, and put a one under the six; it should look something like this: 6 _ 1