I would like to have my multiple choice answers checked.

Question

3w-10w
A.13w
B.-7w***
C.-7w
D.7w
y=1.2y=1.2z
A.2.4yz
B.1.3y+1.2z
C.1.2y^2+1.2z
D.2.2y+1.2z***
6r+r-5r
A.2r***
B.1r+r
C.0r
D.7r-5r
5x+2(x+6)
A.7x+6***
B.7x^2+12
C.7x+12
D.7x(x+6)
-3m+3m(m+6)
A.6***
B.-6m+6
C.6m+18
D.18

Answer 1

Last two are wrong, I submitted and got 60%...What math did I do wrong?

Answer 2

2?
4 is wrong
5 answer is not given
1 and 3 are right.