Answer:
a) 2.2
b) 35
Explanation:
To answer question one, we must subtract 23 from 89 and divide by 30 to find the unit rate, or the answer to the question. This is because It took 30 minutes to the battery to charge from 23% to 89%. We are trying to find how much percent it is charged every minute, so we can divide that value by 30.
89 - 23 = 66
66/30 = 2.2
2.2 percent per minute
To be fully charged, it is 100 percent charged.
We can subtract 89 from 100 and divide by 2.2. We then add by 30 to add the charging time from 23 to 89 minutes.
100-89 = 11
11/2.2 = 5
30 + 5
35