Wally is playing with his toy robot. The robot's battery is 85% full when he starts playing with it. The battery drains to 74% after Wally plays with the robot for 40 minutes.
If t represents the time elapsed in minutes and l represents the battery level, which of the following equations can be used to model this situation?
A. I = -0.275t + 85
B. I = 85t + 0.275
C. I = -0.275t - 85
D. I = -0.275 + 85t
The correct equation to model this situation is:
C. I = -0.275t + 85