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A solution set makes a mathematical sentence TRUE.
I don't know what a 'mathematical' sentence is. I'd prefer to call it an English sentence that describes a mathematical process and makes a statement concerning mathematical matters.
Square root is a mathematical function whose argument needs to be a mathematical quantity or expression. Since helium is neither a mathematical quantity nor an expression, the question makes no sense.
The associative property definition is this : you can group two numbers multiply them together then multiply that product by the other number. For example (3x3)x3=27 so basically all the associative property is about is grouping the numbers in different ways and making the problem faster and easier depending on what numbers you are multiplying. Hope that makes it easier 
The two mean the same thing A product is a multiple.