Question

the greenhouse effect occurs on many planets . if the actual temp of venus is -40 degrees , and the temp of the greenhouse is 800 , what is the difference?

Answer 1

A difference of 840 degrees

800 - (-40) = 840

When removing a negative number from a positive number you get a positive

- + - = +
800 - (-40)
       ^  ^
Negatives (2)