Learn Polish: Jaki jest ten samochód? — Drogi. - What is this car like?

In Polish, co means "what" as a noun (like "What is this?"). But when asking "What is it like?" or asking for a description, you use jaki. It acts like an adjective, so it takes the masculine form to match the masculine noun samochód (car).

Why does the masculine adjective drogi end in -i instead of the usual -y?

Most masculine adjectives in their basic form end in -y (like dobry or stary). However, a strict spelling rule in Polish says you can never write a y directly after the letters k or g. Because the root of "expensive" ends in g, the ending changes to -i, making it drogi.

Could I change the word order to Jaki ten samochód jest?

You would be understood, but putting the verb jest right after the question word is the most natural word order in Polish. It usually sounds better than leaving the verb for the very end of the sentence.

Why is the word ten (this) important here?