Why did congress place the house and senate on the top of the list

Because they are the most powerful people who rule/govern something.

Explanation:

They did this because they were the most powerful rulers!

The additive inverse is the opposite of a number, meaning that if a number is positive, it's opposite is negative and vise versa. John's total weight change was -4, because he gained 8 and lost 12. Because of the additive inverse property, we know that the additive inverse of -4 (his weight change) is 4.