What will be the rate of change in the size of Bianca's workforce between years $$3 and $$4?

To determine the rate of change in the size of Bianca's workforce between years $$3 and $$4, follow these steps:

1. Identify the workforce size in year $$3: Let's denote this size as $W_3$.

2. Identify the workforce size in year $$4: Let's denote this size as $W_4$.

3. Calculate the difference in workforce size: Subtract the workforce size in year $$3 from the workforce size in year $$4. $\Delta W = W_4 - W_3$

4. Determine the time interval: The time interval between year $$3 and year $$4 is 1 year.

5. Calculate the rate of change: Divide the difference in workforce size by the time interval. $\text{Rate of Change} = \frac{\Delta W}{1 \text{ year}} = \Delta W$

Thus, the rate of change in the size of Bianca's workforce between years $$3 and $$4 is $\Delta W$.