You can do this by creating a free account at Google Docs, uploading it there, then copying and pasting the embed code into your blog. You can read more at the link below. It has a good explanation of what to do:

http://en.support.wordpress.com/google-docs/

I'm not sure what you mean. But what you can do is attach your excel file to your website. I don't remember how I did it. But it becomes a link that opens to your excel file. I believe it's the same way as adding a link. Instead of putting the URL, you put your file name. I was able to put a link to my powerpoint in one of my websites. I hope this makes sense.

If I am not mistaken I think you can only do it as an image unless someone knows any different please help