Depends on the horse, how much you use them, and many other factors. For an average horse, my calculated cost would be about $500 per month plus $100 vaccines bi-annually (counting boosters) so a year would be $6,100 not including any sickness or injury. So over the lifetime of a horse (approximately 30 years) it would cost you about $183,000 according to my rough calculations. Hope I answered your question.
If they are as strong as a horse... then one!
They all variy my horse is very sweet but one that lives in his field is not at all friendly or wants to come in contact with humans
One horse died.
They can be. It depends on the horse. any horse including mustangs can be depending on the way they act and on how much they trust a person can be a one person horse.
it depends on the area you live in, where you keep the horse, and what you do with it.
Often a human one if domesticated, though not the same way that a dog or cat does. A horse lives in band of horses if it is wild or feral.
home
This depends on how much the person weighs and how much the horse weighs. The horse should be able to carry one third of its body weight.
usually one
One liter of what?
A horse that lives in the wild, one that hasn't been broken and doesn't rely on humans for food and shelter.
It searches for a safe reasonable home in its environment. When it finds one it lives there.