When the nation's leaders met in 1787, these three problems needed to be addressed: tax collection irregularities in voting procedures law enforcement trade between the states slavery?

The correct answer is tax collection, law enforcement, and trade between states.

All of these problems were a result of the weaknesses in the Articles of Confederation. The Articles of Confederation was America's first constitution. Scared of having a strong central government, the Americans created a system in which state governments had almost all the power. All of the problems listed represent actions that the central (aka federal) government struggled with under the Articles of Confederation. In order to be a successful country, this needed to be changed.

uniform, random, and clumped.

explanation:

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the answer is: must pay taxes on profits

since it is considered as a part of your income, profits from investments is eligible for tax payment.

the tax from your investment could be influenced by how long you decided to sell it. united states promotes keeping your investment for long term period. so, the tax rate for investments that you sell in less than one year is typically higher compared to investments that you sell in more than one year period.