Jorge was tracking the decreasing temperature in the morning. At 7 a.m., it was 65 degrees Fahrenheit. At 9 a.m., it was 55 degrees Fahrenheit. If Jorge made the function f(x) = −5x + 100, what would the −5 represent?
a. The temperature at midnight
b. The length of time he recorded for
c. The total change in degrees
d. The rate at which the temperature was decreasing