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 rory’s phone have been plugged into the charger? select three options. ☐ 6 hours ☐ 9 hours ☐ 11 hours ☐ 14 hours ☐ 19 hours

Explanation:

When charging, battery life should increase or stay at 100%. Analyzing the graph:

• At 9 hours: Battery starts increasing (so charging starts around here).
• At 14 hours: Battery is low, then increases (charging starts).
• At 19 hours: Battery stays at 100% (charging or full). 6 hours: battery is decreasing (not charging). 11 hours: battery is at 100% (maybe charging, but 9,14,19 are more consistent with charging phases). Wait, recheck: The graph has a rise around 9 - 12, then drop, then rise around 16 - 19? Wait, the x - axis: at 8 hours, battery is low, then at 9 - 12, it rises (charging). Then drops, then at 16 - 19, rises again. Also, at 19, it's stable. So 9 (start of first charge), 14? Wait no, at 14, battery is dropping? Wait maybe I misread. Wait the graph: x - axis hours, y - axis battery. At 0, 100. Then decreases to 8 hours (low). Then from 8 - 12, it rises (charging: 9 is in this interval). Then decreases, then from 16 - 20, rises (19 is in this). Also, maybe 14? No, at 14, it's decreasing. Wait maybe the options: 9 (when charging starts, battery increases), 14? No, wait the three correct are 9, 14? No, let's think again. The battery increases or stays at 100 when charging. So the times when battery is increasing (so charging) are around 8 - 12 (so 9 is in), then after a drop, around 16 - 20 (so 19 is in), and maybe when it's at 100? Wait the options: 9 hours (battery is increasing, so charging), 14 hours? No, at 14, battery is decreasing. Wait maybe the graph has a peak at 12, then drops, then at 16, starts rising again. So 9 (during first charge), 14? No, maybe 11 (at 11, battery is at 100, so charging), 14? No, I think the correct options are 9 hours, 14 hours? Wait no, the problem says select three. Wait the graph: at 8 hours, battery is low (around 20 - 30). Then from 8 to 12, it goes up to 100 (so charging from 8 - 12, so 9 is in). Then from 12 to 16, it drops to around 60. Then from 16 to 20, it goes up to 100 (so charging from 16 - 20, so 19 is in). Also, maybe at 14, it's still dropping, so no. Wait maybe the three are 9, 14? No, I must have misread. Wait the options: 6 hours (battery decreasing), 9 hours (battery increasing - charging), 11 hours (battery at 100 - charging or full), 14 hours (battery decreasing), 19 hours (battery at 100 - charging or full). Wait no, maybe the graph has a second rise after 14? Wait the y - axis at 14: maybe the battery is at 60, then rises? Wait the user's graph: "Phone Battery Life" with x from 0 - 20, y from 10 - 120. At 0:100, then down to 8 hours (20 - 30), then up to 12 hours (100), then down to 16 hours (60), then up to 20 hours (100). So charging periods: 8 - 12 hours (so 9, 11 are in), and 16 - 20 hours (so 19 is in). So the three options are 9 hours, 11 hours, 19 hours? Wait the options are 6,9,11,14,19. 6: decreasing (no), 9: in 8 - 12 (charging, yes), 11: in 8 - 12 (yes), 14: decreasing (no), 19: in 16 - 20 (yes). So three options: 9 hours, 11 hours, 19 hours. Wait but the problem says "select three options". Let's confirm: when charging, battery % increases or stays at 100. So during 8 - 12, battery increases (so 9,11 are times when it's charging). During 16 - 20, battery increases (so 19 is when it's charging or full). 14: battery is decreasing (so not charging). 6: battery is decreasing (not charging). So the three are 9 hours, 11 hours, 19 hours.

Answer:

9 hours, 11 hours, 19 hours