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What do you call the order mathematical operations must be done when more then one operation is involved?
Brackets (or parentheses) Order (or powers) Division Multiplication Addition Subtraction.
In what direction are operations done?
Left to right.
Is it true no one invented order of operations?
Not really. It's entirely arbitrary that multiplication is done before addition. We could imagine a system in which addition is done first: in this system, 2*3+5 would be 2*8 or 16, and if people wanted the other order, they'd write (2*3)+5. The reason for the order of operations that everyone uses is mostly tradition, but it also makes sense because you usually want to multiply before you add.
What is the definition of operator in math?
An operator is "a symbol or function representing a mathematical operation." In other words, it's the symbol telling you what should be done in the equation, (i.e., add, subtract, multiply, divide...)
If n plus 20 equals 26 then what is n?
Subtract 20 from each side: n= 6. Job done. You could have done that!
