20d
Yes, you can. Any EF and EF-S lens will work on 20D.
no
You cannot record video/sound with Canon EOS 20D. It takes only photos with RAW/jpg output format.
If you mean: 3d2+20d+12 then it is (3d+2)(d+6) when factored with the help of the quadratic equation formula
4d (d + 5)
20ºC = 68.0ºF
It is: 5d(4) = 20d
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A Canon EOS 20D can be purchased from any good camera store. If they do not have it in they can order it. If someone is happy to buy online then it can be bought on Amazon.
2(A+B)+20d-5d
A good place to buy the Canon EOS 20D is directly from Canon. Other good places to purchase this camera is from eBay or Amazon where one can often find discounted prices.