Crossword Puzzle: "Equations are Fun"

https://i.imgsafe.org/6f/6fcac0fecc.png

Solution: (This link will give you a "Not Found" page. Just add ".png" to the end of the url in your address bar to get the solution. It's my work-around so the solution doesn't just show up at the bottom of this page. Enjoy!) https://i.imgsafe.org/6f/6fd5bc736e