Question

WILL GIVE MEDAL

Answer 1

http://prntscr.com/566e02

Answer 2

you add 10 not subtract

Answer 3

5x=20
x=4

Answer 4

the third one

Answer 5

Yes. He did not add 10
What he did:
\[5x-10=10\]\[5x=0\]

What he should have done
\[5x-10=10\]\[5x=20\]

Answer 6

He forgot to flip the sign when moving to the RHS

Answer 7

so its the 3rd choice right?

Answer 8

Yes @VJT :)

Answer 9

yes

Answer 10

I'm going to be posting more questions can you guys help

Answer 11

If I can, ill try ;)