**Learning objectives**

- Recognize problems that lead to definite integrals over 2-D regions
- Work problems involving piecewise constant densities by subdividing a region
- Interpret integrals of densities
- Evaluate integrals numerically using tables of values or contour diagrams
- Evaluate integrals over rectangles algebraically (iterated integrals)

**Resources**

- Textbook Chapter 16-1, 16-2 through page 877.

**In Class**

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