The percentage of battery remaining after a certain number of hours after a cellphone is turned on can be represented by the graph shown.
110y
100
90
80
70
60
50
Battery
40
Remaining 30
20
10
Percent
of
0
1 2 3 456 7 8 9 10 11 12 13
Number of Hours
Part A: Write an equation in slope-intercept form to describe the relationship in the graph. (2 points)
Part B: Explain how you determined the equation. (1 point)
Part C: What is the meaning of the slope in the given situation? (1 point)