Question

At noon the outside temperature was –5°F. By 4 p.m. the same day, the temperature had dropped 13°F.



What was the outside temperature at 4 p.m.?



At 4 p.m. the outside temperature was °F.

Answer 1

If the temp started at -5 and you are dropping another 13 degrees, that is going further in the negative. - 5 plus another -13 gives you -18. It's just a matter of adding negatives.