Question

3. At the beginning of an experiment, the temperature of a substance was
7.8°C. In one hour, the temperature of the substance had decreased by
13.9°C. Meredith said that the temperature after an hour was -4.1°C.
Write and evaluate an expression to determine if her answer is reasonable.
Explain your answer.

Answer 1

Answer: She is not correct

Explanation:

Subtract the first two values given to get:

7.8 - 13.9 = -6.1

The temperature after one hour is -6.1 degrees Celsius instead of -4.1 degrees C. Meredith is off by 2 degrees.