Since they couldn't use tools it is not likely.

Unlikely. I read or saw a documentary that there were pigmy Mammoths on an island off Alaska within the last few thousand years. Whatever that’s worth

The very last mammoths died out around 4000 years ago on Wrangel Island, and so it's not impossible that they were used during the contruction of the Pyramids. However, transporting a large wild animal evolved for survival in very cold climates to a very warm climate and then putting it to work would be logistically extremely difficult - if they had in fact used large animals (Egyptology is not my area, but so far as I know there's no evidence that they did), it would have made far more sense to use elephants. So, although not impossible, it's very unlikely.

Yes

Yes