**Learning objectives**

- Interpret partial derivatives as multipliers
- Compute partial derivatives starting from tables, contour diagrams, and formulas

**Before class**

- Read Hughes-Hallett sections 14.1, 14.2, 14.3.
- Ponder Hughes-Hallett problems:14.1: 1, 3, 5, 9-12, 17, 19, 23, 26–27, (29 for a medical application); 14.2: 1, 3, 5, 13, 21, 41, 42; 14.3: 1, 17, 18, 20, 24, 26.
- Complete HW3 on WeBWork
- Post to Piazza
- Write solutions to problems 13.1: 40; 13.2: 18; Chapter 13 Review: 58, to turn in at the beginning of class.

**In class**

- Review of 1-variable derivatives
- Introduce partial derivatives and work problems

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