### Home > CALC > Chapter 7 > Lesson 7.1.3 > Problem7-32

7-32.

If Hoi Yin's hair is of length $h$, then explain what $\frac { d h } { d t }$ represents. Is it positive or negative?

The derivative represents instantaneous slope (growth). Is the length of Hoi Yin's hair growing at a positive or negative rate?