Soru
x __ Coal and oil are __ A skateboard and roller blades are substitutes; substitutes complements complements substitutes complements substitutes; substitues
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Coal and oil are complements. A skateboard and roller blades are substitutes.Explanation:- Complements are goods that are used together, such as coal and oil, where coal is used to generate energy to refine oil.- Substitutes are goods that can replace each other, such as a skateboard and roller blades, where one can be used instead of the other for the same purpose.