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? choose three correct answers. 9 hours 19 hours 6 hours 11 hours 14 hours

Explanation:

Charging causes battery life to increase or stay at 100%. We look for upward-trending or flat (100%) segments on the graph and identify times within those intervals:

1. 8-12 hours: Battery rises from 20% to 100% and stays flat, so 9 hours falls here.
2. 16-20 hours: Battery rises from 60% to 100%, so 19 hours falls here.
3. 10-12 hours: Battery stays at 100%, so 11 hours falls here.

Times like 6 and 14 hours show decreasing battery, so they are not charging periods.

Answer:

• 9 hours
• 11 hours
• 19 hours