What were the 3 decisions made at the constitutional convention when it began?

Answer 1

Their plan provided for equal representation in the Senate, along with representation in proportion to population in the House of Representatives. This proposal became known as the Connecticut Compromise or the Great Compromise.
A compromise decided that Congress would not be allowed to regulate the foreign slave trade until 1808. Another compromise involved the question of how to count slaves in determining the number of congressmen a state could have. Slaves were not considered citizens, and so the Convention agreed that only three-fifths of them could be counted.
The delegates agreed that each state should hold a special convention to discuss and vote on the Constitution. They also decided that as soon as nine states had ratified (approved) the Constitution, the Constitution would take effect and they could begin to organize their new government.