Answer:
The total number of minutes, m.
Explanation:
The dependent variable is the variable in which the variable cannot stand by itself.
In this situation, the total number of minutes, m, equal 20 times the number of d.
m = 20d
d, is a variable which can be multiplied which states that it has a value, no matter what. On the other hand, m, requires d, to be there in order to have a value.
The answer is, m, the total number of minutes.