Simplify each expression if possible by combining like terms. If not possible, write simplified

Question

2x+9x

I don't understand what to do

Answer 1

Didn't mean for it to be proportions as my school subject.

Answer 2

11x

Answer 3

4c-8c

Would it be a negative

Answer 4

Kuai is right.

Here's an excellent explanation of like terms.

http://www.mathsisfun.com/algebra/like-terms.html

Answer 5

Yes. 4c - 8c = -4c

Answer 6

What does it mean if possible by combining like terms?

Answer 7

You couldn't combine like terms if there are no like terms.

Answer 8

Oh, okay. And How would you solve an expression that had exponents too? For example

7d^2 - 5d

Answer 9

Check the website for unlike terms.