Answer:
All except 4th and last.
Explanation:
The one that says equation is definitely wrong because it doesn't have an equal sign anywhere (there is nothing to solve there).
The one that says 5 plus x^2 that means 5+x^2 instead of 5x^2.
They should have said 5 times x^2 there which actually means 5x^2.
So I don't like the way some of these are written but the only two that are really wrong are the 4th one and the last one.