Anumber is subtracted from 7, then multiplied by 3. the answer is half the original number. what is the number? 2 2.8 6 6.83 8.4

The answer is 2 because 2(3)= 6, and 7-6= 1. And 1 is half of the original, which is 2!

Are 24 and 864 supposed to be negatives?

If so, that means that each term is multiplied by negative 6.
So, 4 times -6 = -24. Then -24 x -6 = 144. And so on.

So -864 x -6 = 5,184. (5th term)
5,184 x -6 = -31,104. (6th term)
-31,104 x -6 = 186,624. (7th term)
186,624 x -6 = -1,119,744. (8th term)

I think, and hope, that it is correct. Hope this helps! :)