At 9:00 a.m., a cup of tea was heated to $200$ degrees Fahrenheit and then left to sit in a $70$ degree kitchen. The graph of $T = f(t)$ shows the temperature (in degrees Fahrenheit) of the cup of tea as it cooled down toward room temperature, where $t$ is the number of minutes after 9:00 a.m. By moving the slider, you can change the time at which the tea stopped heating and began to cool. For instance, if it began to cool at 9:20 a.m., then the graph would be exactly the same — just shifted to the right by $20$ minutes. This corresponds to subtracting $20$ from the input of the function $f\text{.}$