encircle the virable / sinearch expression
6. 20+ m
7. 12(x-y)
8. 100mn
9. 2s-5
10. 3x2+3y
11. 15b-2c+7
12. 4.11s
13. 259​


Sagot :

Answer:

6. m

7. x, y

8. mn

9. s

10. x , y

11. b, c

12. s

13. none

Take note: A variable is any LETTER in an Algebraic expression / equation.