I need help solving 15 math equations. I’m confident with 15 I finished out of 30 but I am not…

I need help solving 15 math equations. I’m confident with 15 I finished out of 30 but I am not confident with the other half. I need to compare my solutions to make sure I am on the right track. Here or the equations http://www.mediafire.com/?rad3qfv30wd8ah9