Not sure about the summer part, but the answer should be 1 / 6. Maybe your question is wrong.
Answer:
2+2 is 22 ahahahhahaha just kidding
Looking at the chart, we can see that with diet chow, the weight changed by -26, while with kitty diet, it changed by -13. Therefore, the Diet Chow was more effective
I think it is a rectangle..........But i'm not sure what are your options
-3*0 is 0-4 is -4 which is less than -2
-3*3 is -9-4 is -13 which is also less than 2