Question

rory records the percentage of battery life remaining on his phone throughout a day. the battery life decreases as rory uses the phone, but will increase or stay at 100% while charging. the graph represents the percentage of battery life remaining after a certain number of hours. at which times could rorys phone have been plugged into the charger? select three options. 6 hours 9 hours 11 hours 14 hours 19 hours

Explanation:

Step1: Analyze the graph

When the phone is plugged into the charger, the battery percentage either increases or stays at 100%. Looking at the graph, at 9 hours, 11 hours, and 19 hours, the battery percentage is either increasing (from 20% at 8 hours to 100% at 10 hours - so around 9 hours it's charging) or at a plateau (100% from 10 - 14 hours, so 11 hours is during charging) or increasing (from a low value before 19 hours to 100% after - so 19 hours is during charging). At 6 hours, the battery is decreasing (from 100% at 0 hours to 20% at 8 hours, so 6 hours is part of the discharging phase). At 14 hours, the battery is decreasing (after the 10 - 14 hours plateau, it starts to decrease).

Answer:

9 hours, 11 hours, 19 hours