Question

For a science project, Kenji is studying the rate that a cell phone battery drains while being used in different ways. He charged his phone fully, then set the phone to play music until the battery was completely drained. He did not use the phone in any other way during that time. It took 7 hours for the battery to completely drain. The function B(t) represents the percentage of battery charge remaining, t hours after Kenji started playing music.
What is the range of B(t)? Real or Whole

Answer 1

B(t) takes every percentage from full to empty, so its range is all real numbers from 100 down to 0 inclusive. In interval notation: [0, 100].

So the range is real (not just whole) numbers.