Find the sum or difference.

1. x-2+x+6
   
   
2. 2n-4n-3
   
   
3. 2(-3y-1)+(2y+7)
   
   
4. (6g-9)+1/3(15-9g)
   
   
5. (1-3k)-4(2+2.5k)
   
   
6. 1/2(2r+4)-1/4(16-8r)
   
   
7. You earn (4x+12) points after completing x levels of a video game then lose (2x-5) points. Write an expression that represents the total number of points you have now.
   
   

Factor the expression using the GCF.

1. 7+28
   
   
2. 25+50
   
   
3. 7b-7
   
   
4. 8a-16
   
   
5. 8x+12
   
   
6. 12y+34t
   
   
7. 10w+50z
   
   
8. 10v+12n
   
   
9. 9a+15b
   
   

Factor out the coefficent of the variable.

1. 1/2a - 1/2
   
   
2. 1/4d - 3/4