Question

Please help me in question 9 and please explain it

Answer 1

To solve this question, remember that as per what is given in the problem

X represents the number of hours the batter was used for

Y represents the percent of battery remaining.

The question is simply asking for the percentage of battery remaining after 11 hrs.

Simply plug in 11 for X and solve for y.

Answer 2

If the battery was used for 11 hours, then the value of x we use is 11
Subtitute x with 11 in the equation
y = 100 - 8.9x
y = 100 - 8.9(11)
y = 100 - 97.9
y = 2.1
The remaining power is 2.1%
the answer is option b