Need help with the following math questions

http://www.flickr.com/photos/44727472@N0…
and
http://www.flickr.com/photos/44727472@N0…

Also, if you could check my other answers, I'd greatly appreciate it!
http://www.flickr.com/photos/44727472@N0…
http://www.flickr.com/photos/44727472@N0…

1 ) No, 600 = 60x - x^2 is the expression.
2) http://fooplot.com/#W3sidHlwZSI6MCwiZXEi…

Nobody usually clicks links.

It's better to ask for help on parts and show some effort

That is my opinion on your post.