Step-by-step explanation:
Graphing them is the best way to tell (I put one from Desmos in th attachment scribbled on it a little to match our situation). Otherwise you'll just have to know which one is going to be where on the interval given; but that knowledge comes by graphing them a lot anyways.
Also remember to draw your strips/lines from the axis of revolution to the curves. The longer one will represent the outer radius of the volume and the shorter one the inner radius.
So:
- Graph the functions.
- Draw your strips/lines
- Outer is longer, Inner is shorter
Comment with any questions.
