Learn Spanish (Latin America): Hay tres carros y cuatro bicicletas aquí. - There are three cars and four bicycles here.

In Spanish, most numbers don't change their endings to match the gender (masculine or feminine) of the things you are counting. Whether you have four masculine cars (cuatro carros) or four feminine bicycles (cuatro bicicletas), the word for four stays exactly the same: cuatro. The only number you will use right now that changes its ending this way is one (un or una).

Does the word hay mean 'there is' or 'there are'?

It means both! The word hay is very handy because it never changes for singular or plural. You can use it to say 'there is one car' (hay un carro) and 'there are three cars' (hay tres carros).

Is the word for four spelled cuatro or cuarto?

It is spelled cuatro for the number four. A very common beginner mistake is mixing it up with cuarto, which means 'fourth' or 'room' (like a bedroom). Just remember that the number four has the t before the r.

I have seen the word coche used for car before. Why is it carro here?