Question

While playing games on a particular smart phone, 1% of the battery is drained every five minutes of game play. The battery starts off at 80% full . This can be represented by b(m)=80-m/5. What does B(75) represent?

Answer 1

B(75) represents the percent of battery full after 75 minutes of game play

Explanation:

Let m represent the number of minutes of game play. If 1% of the battery is drained every five minutes of game play, then after m minutes of game play
`(m)/(5)\%` was drained.

The battery starts off at 80% full. After m minutes the battery will have

`B(m)=80-(m)/(5)`

percent full.

When
`m=75` minutes, then

`B(75)=80-(75)/(5)=80-15=65\%.`