Question

One spring day, Jordan noted the time of day and the temperature, in degrees Fahrenheit. During that time, the temperature rose, stayed steady, and fell, at different rates. On the set of axes below, Jordan created a graph of temperature over time.

Answer 1

(c) Dropping 2° in 1 hour

Explanation:

Given a graph of temperature versus time, you want to know the rate of change of temperature at 8 pm.

Rate of change

The rate of change is the slope of the graph, its "rise" divided by its "run." This graph shows a temperature change of -4° over a period of 2 hours around 8 pm. The rate of change is ...

(-4°)/(2 h) = -2°/h

The temperature is dropping at a rate of 2 °F every 1 hour.