Because the difference between 100,000,000 and -100,000,000 is greater than a hyphen. Mathematical sentences without symbols would be as nonsensical as regular sentences without verbs: they tell you what to do.
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A number by itself is meaningless. Symbols and labels add meaning in math. Symbols in math are used to represent different operations, and/or add descriptions. There are many different symbols each which have their own purpose. Some symbols have different purposes in different types of math.
Dr John Math is not a real person. A lot of math symbols come from the greek.
egyptians use symbols as we use numbers.they still are using symbols for math at this very day!
Math
Well in math an expression is a finite combination of symbols that is well-formed according to rules that depend on the context. Symbols can designate numbers (constance), variables, operations, functions, and other mathematical symbols, as well as punctuation, symbols of grouping, and other syntactic symbols. The use of expressions can range from the simple: 3 + 5 it is as easy as 1 2 3 but as you get older your math expressions will get harder.