Re: 3 tickets in one day...
License plate must be properly displayed with no visual obstructions. Slanted on your dash behind your window is not properly displayed.
Once the officer has pulled you over he can write you citations for anything even if the first thing was not correct. In your case it was.
Put your license plate on properly, and take a picture of it. You may get out of that ticket. The other two, get some money together to pay the fines.