5.4 + (-9.7)
10.8 + (-4.73)
-4.79 + (-0.4)
-10.9 + 6.1
2.2 - 7.3
-8.1 - (-8.9)
-18.278 - (-6.8)
17.9 - (-19.4)
Heike has two rocks. If the total weight of both rocks is 54.283 kilograms and the first rock weighs 29.928 kilograms, how much does the second rock weigh?
At dawn, the temperature at the summit of a mountain was -8.5 degrees Celsius. By noon, the temperature increased 3.6 degress Celsius. What was the temperature at noon?