Answer: Hello, your answer would be 3.31 liters.
Explanation:
The first thing to do would be to add 4.46 and 2.8 to get the total amount of liters.
4.46
+2.8
----------
7.26
Then we would subtract the amount the guests drank.
7.26
-3.95
----------
3.31
Therefore, Joan has 3.31 liters of punch leftover