Curated OER
Worksheet 30 - Definite Integrals
In this integral worksheet, students find the volume of solids, compute definite integrals, and identify the limit of the terms. This one-page worksheet contains 7 multi-step problems.
Wolfram Research
Wolfram Math World: Octant
This page from MathWorld.com provides a good diagram of the eight octants of the Cartesian coordinate system. (Good picture, but not much explanation is included!)