Mr. skinner has four dogs. he recorded the number of cups of dog food each dog ate over the same month. bailey ate 45 cups of dog food. fido ate 60 cups of dog food. gunner ate 75 cups of dog food. spot ate 30 cups of dog food. then, he compared the amounts of food each dog ate. bailey ate ? for each cup fido ate. fido ate ? for each cup bailey ate. gunner ate ? for each cup spot ate. spot ate ? for each cup gunner ate.

So to find the answers for each of these, divide the first dog's amount mentioned by the second dog's amount mentioned. For instance, the first one would be 45 over 60, also equal to 3/4. So Bailey ate 3/4 cup for every cup fido ate. Repeat this same process with all the other questions and you can get the following answers:
Fido ate 1 1/3 cup for each cup Bailey ate.
Gunner ate 2 1/2 cups for each cup Spot ate.
Spot ate 2/5 cup for each cup Gunner ate.
Hope this helps!

C. i believe it is (5×(-20))+(100×(0.7))