## College Algebra (11th Edition)

To calculate the rate of change between two points $(a,f(a))$ and $(b,f(b))$, where $b \gt a$, we use the formula: rate of change$=\frac{f(b)-f(a)}{b-a}$ We use the two points $(0,3)$ and $(4,3)$: rate of change$=\frac{3-3}{4-0}=0$ Thus the percent of pay raise is changing at a rate of 0 per year. In other words, the percent of pay raise is constant from year to year (at 3%).