Can i send transcript of tax return from irs that i printed online for affidavit of support?

Yes you can. Transcripts are even better than the 1040s.

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Change of status (COS) from H1B to F2 dependant

You can apply while still in a valid h1B status.

I got my work permit based on my 485. My 485 is denied n I'm filing Mtr. can I renew my work permit while mtr is pending?

I agree with both colleagues. You can wait until MTR is adjudicated and if approved apply for EAD or you can refile I485 and apply this way.

How many times can AC 21 be used?

You can apply each time you qualify. there is no limitation.

Unmarried children of US citizen has to be single at the time of entry to US for i130 ?

Yes, you need to stay unmarried until you get your green card.

Can I apply for political asylum after being in the US on F1 visa for the second time, but both times less than a year?

Yes, you will have to prove you are eligible and explain why now.

Which address should I update on AR-11 to USCIS?

You can still file AR-11 and change you address. Use one for the most recent one. You can just file the forms and not file AR-11 in this situation.

Would the occupation title effect the priority date retention ?

One can be educated and experienced in several occupations.

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H1B transfer and out of status. Urgent help needed.

Once timely filed, a new petition would allow you to stay in the USA awaiting adjudication even if you do not start working for new employer until...

This is not an immigration question. Talk to an attorney in Florida.