Question

Rory records the percentage of battery life remaining on his phone throughout a day. The graph represents the percentage of battery life remaining after a certain number of hours. A graph titled Phone Battery Life. The horizontal axis shows Elapsed Time (hours) numbered 2 to 20, and the horizontal axis shows Battery Life (%) numbered 10 to 120. A line begins at 100% in 0 hours, to 20% in 8 hours, to 100% from 10 to 12 hours, to 60% in 16 hours, to 100% from 17 to 20 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

Answer 1

9,11,19

Explanation:

let x be the hours and y the percentage

x=0 , y=100

x=8 , y=80

x=9 , y=0

x=10 , y=100 , x=11 still charging so it is still plugged in

x=16 , y=60 and so on ....

x=18 , y=20

and it will charged again

the answer is 9,11,19