4,2,0,-2,-4,-6,-8,-10 because you subtract 2 each time
Since she already owns one, and they are priced for 2 for a dollar. She would only need to spend $2 dollars to have for and then she will have 5 in total.
I personally don’t know the answer so i can’t help
4/12 is less than 4/6
4/12 = 2/6
and 2/6 < 4/6