Please don't write "of the expressions below" if you don't provide the list. We can't guess what list you are seeing.
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The question asks about "expressions below". In such circumstances would it be too much to expect that you make sure that there is something that is below?
These can be found through your textbook. You can look through the specific chapter to find the information that you need.
If you multiply all the prime factors you've found together and the result is the number, you have found all of them.
When each one of them is a prime.
Let's denote the two digits as x and 2x, where x is the smaller digit. Since the number is odd, 2x must be an odd number, so x must be an even number. The only even number less than 5 that satisfies this condition is 2. Therefore, the number Dan found is 52.
That of course will depend on what system of equations are they which have not been given