It depends on the context. A dot could be:
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It means to multiply. There is also a star that means to multiply too. hope this is helpfull now.
sum means the answer of a math problem
Justification in math terms means to show how you solved the math problem. Lay out the problem and show step-by-step how the problem is solved.
The word increased in a math problem means you are adding to terms or numbers.
C ; solution means the answer to an addition problem in math .