Sorry to bug again but can someone check my answers please thank you.

Question

1. Simplify the expression 3w-10w
A. 13w
B. -7w
C. -7
D. 7w
2. Y+2y+3z
A. 2y+3z
B. 3y+3z
C. 2y^2+3z
D. 6yz
3. 6r+r-5r
A. 2r
B. 1r+r
C. 0r
D. 7r-5r
4. 5x+2(x+6)
A. 7x+6
B. 7x^2+12
C. 7x+12
D. 7x (x+6)
5. -3m+3(m+6)
A. 6
B. -6m+6
C. 6m+18
D. 18
My answers
1.B
2. A
3. D
4. B
5. C??
I’m not sure on 5 but please check my answers if they are wrong tell me the right answer or how to solve it. Thanks

Answer 1

1.B - yes
2. A - no
3. D - yes
4. B - no
5. C?? - no
3m - 3m = 0

Answer 2

Thanks Ms. Sue for all of the help.

Answer 3

You're very welcome.

Answer 4

1. B
2. D
3. A
4. C
5. D

Answer 5

Hello There is correct!

Answer 6

The answers are :
1. B
2. D
3. A
4. C
5. D

Answer 7

Hello There and Ms. Sue 2.0 are correct!!