No, they are binary operators. Two numbers (or variables) are combined, according rules of operation to give a single answer.
Because they can both have variables.
They both have variables. They both have addition, subtraction, multiplication, and division.
who discovered addition and subtraction.
definiton of addition and subtraction
Addition and subtraction are reverse operations.
Addition is the inverse operation to subtraction.
Addition and subtraction are inverse functions.
Subtraction can be seen as the inverse operation to addition.
Subtraction is the addition of a negative number.
You don't. You can check addition with subtraction or subtraction with addition, since subtraction is the opposite of addition. Similary, you can check division with multiplication, or vice versa.
An expression made with constants, variables and exponents, which are combined using addition, subtraction and multiplication, ... but not division.
Addition is a sum and so is subtraction. So there's your answer!