Good question! For the "Quick Response" questions, unless it is a multiple choice problem you answer should just be a number / decimal (with no units, dollar signs, etc.).
As an example to hopefully make things clear. For the made up simple question "George has a one dollar bill and a quarter, how much money (in dollars) does he have?"
- Correct Way to Input: 1.25
- Incorrect Ways to Input: $1.25, 125 cents, 5/4, 1 and 1/4 dollars, etc.
Hope this helps!