That means that you are supposed to add them.Multiplying the same variable raised to different powers is equivalent to adding the exponents. For example, 10^5 x 10^3 = 10^(5+3) = 10^8. (Using "^" for powers.)
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It depends on whether you are working with variables. You cannot add terms with variables that have unlike exponents.
Yes. When you divide one variable with an exponent from another, you subtract the exponents
It means that it has constants and variables that has a form of something like 7x2+2x+5 or something like that. Variables can not be used as exponents though, and exponents have to be whole numbers. Also, variables can not be a denominator.
You do not. The exponent is only subtracted in division.