To determine the amount of money in the jar after Christine and Ty add their quarters, you start with the initial amount of money in the jar, which is $28.
Christine adds \(C\) quarters and Ty adds \(T\) quarters. Since each quarter is worth $0.25, the total value of the quarters they add is \(0.25C + 0.25T\).
Now, you combine the initial amount with the value of the quarters they added:
\[ \text{Total Amount} = 28 + 0.25C + 0.25T \]
This can be simplified to:
\[ \text{Total Amount} = 28 + 0.25(C + T) \]
However, the expression that directly represents the money in the bank after they add their quarters is:
\[ 0.25C + 0.25T + 28 \]
Thus, the correct response would be:
0.25C + 0.25T + 28