To determine which expression is not equivalent to the other three, you have to simplify each expression and compare the result.
This means that you have to solve the operations between the like terms.
Like terms are those who have the same variables/ exponents.
For example
10 and 8 are both constants, they can be considered like terms
x and 3x are like terms, they have the same variable "x" and the same exponent "1"
5y² and -7y² have the same variable "y" and the same exponent index "2", so they can be considered like terms.
Expression A
[tex]-9-7n+16n[/tex]The terms "-7n" and "16n" are like terms, so you can add them to simplify the expression:
[tex]-9-7n+16n=-9+(-7n+16n)=-9+9n[/tex]Next, you have to order the terms from greatest to least. The terms with a variable are considered to be greater than the