need someone to check my work. please!

[purpledragooon]

please Don't tell me just to do backwards because i have done that but i need to be sure i am doing this right. i attached a photo work is done on seperate pages.

 

[daon2]

Just answers? wolfram alpha can check it for you.

 

[mmm4444bot]

[h=2]check my work. please![/h]

Where is the work that you want us to check?