A set s consists of all real numbers between 17 and 21 , inclusive. Use set-builder notation to define s

Choice C

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Explanation:

The curly braces tell us we're dealing with a set of values.

The notation means "x is in the set of real numbers". In other words, it says "x is a real number".

Writing tells the reader that x is between 17 and 21, including both endpoints.

Put everything together and means "we have a set of real numbers x that are between 17 and 21, inclusive".

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Extra info:

Choice A can be ruled out because there isn't any number that's both smaller than 17 and also larger than 21 at the same time. The set described for choice A simplifies to the empty set. Choice B is ruled out because this is only talking about integers between 17 and 21; instead of real numbers. A number like 17.5 is left out when we want to include it.Choice D can be ruled out because the endpoints x = 17 and x = 21 are left out (but we want to include them). Also, there's no mention if x is a real number or not.

It’s c. i’m almost sure