How do you evaluate #(- 95) - ( - 68) + 39+ 4#?
When we subtract a negative number, we end up adding. I'll describe this using cold cubes (each one makes the temperature 1 degree colder) and hot cubes (each one makes the temperature 1 degree hotter):
Let's say we have a place where there are a bunch of cold cubes and a bunch of hot cubes and together the temperature is
The next operation says to add 39 hot cubes. The temperature will go up again:
And we add 4 more hot cubes: