algebra
posted by Katherine on .
I need help showing me how to do some problems..
5. 280.3y = 0.7y12
I got 10/400 or 0.025..
and
3c4c+1=5c+2+3
I ended up getting c=1 but the book says it's wrong too.. What am I doing wrong?

I figured out number 5.
I'm still having problems with the other one though.