When Sebastian left his house in the morning, his cell phone battery was partially
 charged. Let B represent the charge remaining in Sebastian's battery, as a
 percentage, t hours since Sebastian left his house. The table below has select values
 showing the linear relationship between t and B. Determine how much battery life
 Sebastian's phone would have 4 hours after leaving his house.
 t
 B
 1
 36
 2.5
 31.5
 5
 24