This is called the "commutative" property.
Term- a number, a variable, or a product of numbers and variables.
It is called a term.
A "product" is a binary operator. That means, you need two numbers (or variables) before you can define their product.
any number or variable or product of numbers and variables
The product of nine negative real numbers is a negative real number.
Because it is a product of real numbers. And the set of real numbers is closed under multiplication.
No, the product of two negative numbers is always a positive.
135ab is a monomial, where 135 is its coefficient.A monomial is a number or a variable or a product of numbers and variables.
No, they cannot with real numbers. With complex numbers it is possible.