What is -18.1 + 5?

-18.1 + 5 = -13.1

What is −189.987−30.87

-189.987 - 30.87 = -220.857

What is −12−(−6)

-12 - (-6) = -12 + 6 = -6

−1/4+−3/5

-1/4 + -3/5 = (-5 + -12)/20 = -17/20

The temperature in the evening was 5° F. Overnight the temperature dropped 9 degrees. What is the new temperature?

The new temperature would be 5 - 9 = -4 degrees Fahrenheit.

What is 8 − 7 1/4?