Question

When Nicole left her house in the morning, her cell phone battery was partially
charged. The charge remaining in Nicole's battery, as a percentage, can be modeled
by the equation B = -9t + 72, where t is the number of hours since Nicole left her
house. What is the slope of the equation and what is its interpretation in the context
of the problem?

Answer 1

Answer:

The slope of the equation is -9. The interpretation is that every hour her phone battery decreases by 9 percent. (72 is what she left the house with)