Another lesson your book doesn't want you to know about, at least partially. Net change is a convenient way to interpret the answer from the Fundamental Theorem of Calculus, and indefinite integration is just another way of saying antidifferentiation.
Having trouble with the notorious gravel processing FRQ because you need some kind of practical demonstration of what gravel processing entails? I've got you covered. In the course of this video, see if you can spot the guy doing a bit of calculus while supervising one of the processing lines. Duration_2_21