To get -2 from 2, you would multiple by -1.
To get 2 from -2, you also would multiple by -1.
Ad infinitum.
So the common ratio is -1.
Hope this helps.
7.
360 degrees- the other angles = x
I could use the points so if you want to mark this as helpful that would be cool :)
I think the answer is 400 square centimetres
20..................................