What problems were solved by the economic activities conducted in mediaeval period

Some problem that was  solved by the economic activities conducted in medieval period includes

During the Medieval time, the main economic activities includes farming, animal rearing, industry, and trade and were the main sources of income.

Hence, the problem solved by the economic activities conducted in medieval period includes presence of drought through artificial irrigation, a small scale farming, food storage etc

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The feudal system abolished slavery.

Explanation:

During the Middle Ages, the feudal system removed the previous system from the ancient period, which was based on slavery. Slavery did not exist in the Middle Ages, and the economic system created new social classes. In place of slaves came serfs and peasants. These were free people, but their existence depended on the feds or landholdings. A peasant and if a free man, he had to work on the estate to survive.

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d. the polar jet stream   lies between the polar easterlies and trade winds should be your answer