Question

The freezing point of a certain alcohol is -114 celcius. The freezing point of a certain acid is -42 celcius. What is the difference between the freezing point of alcohol and acid?

Answer 1

-72

Explanation:

The difference between each can be achieved by subtracting -42 (the freezing point of the acid) to -114 (the freezing point of the alcohol).

From there, we get the equation -114 - -42, which then leads to equal -72.

A way I check this is that I go back and add our answer to the lowest term, which becomes -42 + -72, which does, in fact, equal -114.

So your answer is -72.

Answer 2

1)You must subtract the two numbers.
-114 - (-42)
2) when you are subtracting by a negative number, it is just like adding, so you can just change the equation too:
-114 + 42