Question

find the rate of change. use appropriate units. 6) monthly cellular phone charge in dollars minutes cellular phone is used

Explanation:

Step1: Identify two points

From the graph, we can see that when \( x_1 = 0 \) minutes, \( y_1 = 40 \) dollars, and when \( x_2 = 60 \) minutes, \( y_2 = 40 \) dollars.

Step2: Use the rate of change formula

The formula for rate of change (slope) is \( \frac{y_2 - y_1}{x_2 - x_1} \).
Substitute the values: \( \frac{40 - 40}{60 - 0} = \frac{0}{60} = 0 \).
The units for rate of change here are dollars per minute, since we are looking at the change in dollars (y - axis) over the change in minutes (x - axis).

Answer:

The rate of change is \( 0 \) dollars per minute.