The denominator would still be the same you placed the marble back into the bag
Answer: the model should be 1.75 feet
You would of taken 28 dollars away after 7 days because if your taking away 4$ each day you just have to figure out 4 times what equals 28 witch is 7
So the answer is 7 days
The answer I think would be y = 5 let me know if I'm wrong