when Henry left his house in the morning, his cell phone battery was partially charged. Let B represent the charge remaining in Henry's battery, as a percentage, t hours since Henry left his house. A graph of B is shown below. Write an equation for B then state the slope of the graph and determine it's interpretation in the context of the problem.
B=
The slope of the function is __ which reveals
° The rate that Henry's phone gains charge per hour
° The charge of the battery when Henry left his house
°The number of hours until Henry's phone died
°The percentage charge that Henry's phone loses each hour​