To find the unit rate of pages per notebook, divide the total number of pages by the number of notebooks.
Given:
- Total pages = 84
- Total notebooks = 4
Now, calculate the unit rate:
\[ \text{Pages per notebook} = \frac{84 \text{ pages}}{4 \text{ notebooks}} = 21 \text{ pages per notebook} \]
So, the unit rate is 21 pages per notebook.