Problema Solution
A battery fully charged can last for 8 hours when used. When not used, the battery loses 7.5% of its charge daily. How much charge will be left in the battery after a week of no use and after a month of no use? Find the exponential function, then evaluate.
Answer provided by our tutors
As the battery loses 7.5% charge daily, the function is f(x) = 8 (1 - 0.075)x = 8 (0.925)x
After one week of no use, the charge left = 8 (0.925)7 = 4.635 hours
After one month of no use, the charge left = 8 (0.925)30 = 0.772 hours