Keira created color panels for a wall using a mix of only red and blue paints. She plotted the quantities of red and blue paints used for each mix and connected them using a line segment, as shown in the graph.
Which statement best describes the domain of the function represented in the graph?
A. 3 ≤ x ≤ 12
B. 3 ≤ x ≤ 7
C. 2 ≤ x ≤ 12
D. 2 ≤ x ≤ 7
The correct answer is b. The domain of the function is in terms of x, so we are looking at the x-axis. The line stretches from 3 to 7 on the x-axis, so we know that b is our answer.
