3.
12 ÷ 2 = 6
27 ÷ 3 = 9
24 ÷ 4 = 6
30 ÷ 3 = 10
15 ÷ 5 = 3
4 + 1.3 = 5.3
5.3 - 5.7 = -.4
The temperature at 10pm was -.4°F
Correct me if I'm wrong. :)
Whenever there are two - signs, this means it turns into a plus. So it would be -
1+2
And it would equal 3!