Lowe's ProServices

I think they do carry it

You can buy bigger size and have it cut

Best to call the store and ask. The staff are friendly and should let you know.

If you are talking about appliances, it is both. Manufacturers limited warranties cover certain failures that third party warranties won't and vice-versa, third party warranties cover most everything.

You Wil have to go to the store hiring kiosk and apply. Ask there if they are hiring.

Yes

Walmart

Do a quick Google search on concrete calculator you'll find dozens of them plug in your slab size and you thickness and it'll tell you