Answer:
Sure. Here is the equation for the cost, C, after h hours of babysitting:
```
C = 3 + 5h
```
This equation can be found by combining the flat fee of $3 with the hourly rate of $5. For example, if Nicole babysits for 2 hours, she will make $3 + (2 * $5) = $13.
To find how much Nicole will make after babysitting for 8 hours, we can simply substitute h = 8 into the equation. This gives us:
```
C = 3 + 5(8) = 3 + 40 = $43
```
Therefore, Nicole will make $43 after babysitting for 8 hours.