C represents the number of four-packs of cartridges because the question says there are 4 pack of 42 ounceink cartridges that sell for 85.99...If you were ever to create an equation with this it would be 42c = 85.99
And you can plug in 4, 8, or 16 for c and check how much they would cost over all...your welcome, have a great day
My answer is a and c becuase they equal the same on each side
15 divided by $3.90 is $3.85. 11 divided by $3.30 is $3.33. so the answer is the rice cereal :)
The answer is 1 2/3 hope this helped