The battery life of a certain cell phone starts at 8 hours. The battery life decreases at an annual rate of 30%.
a. Write a function that represents the battery life y after x years.
A) y = 8(1.7)
B) y = 8(1.77)*
C) y = 8(0.7)
D) y = 8(0.7)2
Part B
After how many years will the battery life of a cell phone be 2 Hours? round if necessary