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2015-06-05T12:40:08+08:00

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Since you are Senior High School it should be like this:
{x | Ǝm∈ N, x=2m, 2≤x≤20}; 
This is read as: The set of all x such that for any number m which is an element of natural numbers, where x is equal to 2m and 2 is less than or equal to x which is less than or equal to 20.

or {x | x∈N, 2≤x≤20, x=2m, m∈N}
This is read as: The set of all x such that x is an element of natural numbers, where x is greater than or equal to 2 but less than or equal to 20, and x is equal to 2m where m is an element of natural numbers.

Any of the two work.
 
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