Final answer:
To find the rate of change for an interval, divide the difference in y-values by the difference in x-values using the slope formula.
Step-by-step explanation:
The rate of change (also known as the slope) for an interval is calculated by finding the difference in the y-values (dependent variable) divided by the difference in the x-values (independent variable).
For the interval [10, 25], let's say the y-values are represented by y1 and y2, and the x-values are represented by x1 and x2. The rate of change can be calculated using the formula (y2 - y1) / (x2 - x1).
Similarly, for the interval [30, 65], you can calculate the rate of change using the same formula.