Question

"noon on a monday the temperature in degrees (F) was -4°F.... at noon on Tuesday the temperature was 6 degrees higher, what is the temperature on Tuesday at noon?"

Answer 1

Your first clue is that is says that the temperature was 6 degrees higher so you know that you will be involved in addition.
Set up your equation.
-4+6=?
Because you are adding a positive to a negative, its the same as doing 6 minus 4.
6-4=2
It was 2°F on Tuesday.

Answer 2

Then the answer would be 2 degrees ferinhieght