Answer:
20 or D.
Step-by-step explanation:
You simply plug in the values given for a and b:

So, your answer is 20.
75(x-2) where x represents the amount originally paid
You have to make the percent a decimal by moving the decimal to the left twice. then you need to multiply the other number.
2 cups of dog food is 194 grams and 3 cups is 291 grams.
The dog needs 220 grams. So at most 3 cups of dog food. Wish I could simplify more but I can't. sorry.