A sample of cold water was mixed with a sample of hot water inside a calorimeter, and the final temperature of the cold water was 40 °C. Which statement is true about the hot water in the calorimeter?
It absorbed 40 joules.
It absorbed 80 joules.
its final temperature was 80 °C.
Its final temperature was 40 °C

The air is going to come out because of the low pressure.

Ineed a picture or something 

Ibelieve the answer is a if i'm correct

The rules are different for multiplication and addition, but the least precise value always restricts the answer. first do the multiplication (as per standard order of operations): 24.6681 × 2.38 ≈ 58.7 since 2.38 has the fewest significant figures, it is considered the lease precise value then do the addition: 58.7 + 332.58 ≈ 391.3 since 58.7 has fewest figures right of decimal it is considered least precise. so final answer: 391.3 with four significant figures.