ok i know its going to be negative because its decreasing but how do I do part c? I honestly have no clue where to start this one. My thinking is that dV/dt means volume(y axis) with respect to time (x axis) related to some ds/dt where s (y axis) is being differentiated with respect to time (x axis). I know how to read leibniz notation I just can't seem to grasp an understanding of it...