From a graph of a function f(x) we can make a sketched graph of its derivative f ' (x). To do this, we use some things we talked about earlier.
Be Careful: The word "it" is dangerous.
Look at these two sentences:
The first sentence is unclear. What does "it" mean? There's no way to know. Whenever we use the words "increasing, decreasing, positive, negative," that we are clear about what (f, f ', or something else?) is increasing, decreasing, positive, or negative.