Adding Rational Numbers Using Properties of Operations This activity will help you meet these educational goals:
Mathematical Practices—You will make sense of problems and solve them and use mathematics to model real-world situations.

Directions
Read the instructions for this self-checked activity. Type in your response to each question, and check your answers. At the end of the activity, write a brief evaluation of your work.

Activity
Raul is performing an experiment. He pours water into a glass and measures the temperature of the water at 72.3°F. Then he adds a few ice cubes to the glass of water. He measures the temperature of the water again and finds that it has changed by -39.1°F.

Complete the steps below to learn more about the temperature change of the water.

Part A
Write an expression that represents the temperature (in degrees Fahrenheit) of the water after Raul added the ice cubes. Write the expression as the sum of two numbers.