Levels of Resolutions for various issues

I would like some advice on Resolutions. Our building contains eight lots, all of equal worth in terms of voting rights. At our upcoming AGM we will be voting on various issues.

My understanding is an Ordinary Resolution requires 50% of the vote in favour to pass, (so in our case four votes in favour out of the eight) a Special Resolution requires 75% (six votes in favour from eight) and a Unanimous Resolution 100% (eight votes in favour from eight)

My question is how is it determined as to which issues requires which level of resolution?

In our particular case for example, what level of resolution is required for our building to do the following?

1. Introduce a bylaw preventing smoking on all common property and balconies.

2. Introduce a bylaw preventing smoking in all areas of the building including common property, balconies and within private lots.

3. Rescind a special bylaw introduced about 15 years ago which currently totally prevents the keeping of animals, and thereby reverting our buildings ‘Keeping of Animals’ bylaw to the standard one where the keeping of animals requires permission but ‘permission cannot be unreasonably refused’?

Also, what happens if some lot owners dont vote at all, either by not attending the AGM in person or by proxy? For example, if two owners don’t bother to vote does the 75% of the vote required to pass a special resolution still require 6 votes from the eight to be in favour, (ie the six remaining owners all have to vote yes) or does it then become 75% of those 6 votes remaining which means 4.5 votes out of 6, which I imagine would be rounded up to 5 out of 6 which is a considerably higher percentage (83%) than than the original 75% required which would disadvantage those owners trying to get the resolutions passed..

Thanks in advance!