Answer:
Independent Variable - p
Dependent Variable - t
Explanation:
The length of the movie is 109 minutes
⇒ Length of the movie is fixed and cannot be varied.
Also, p is the number of minutes taken up by the previews
And t is the number of minutes you spend watching previews and the movie.
Now, The relationship between these two variables can be expressed by the following equation :
t = 109 + p
Here, p is the independent variable as it can take any value and is not fixed on any variable.
But, t is the dependent variable and its value is dependent on the p, the number of minutes taken up by the previews
Thus, Independent Variable - p
Dependent Variable - t