What is the initial value for the equation y=(0.85)^x

What is the percent of change for the equation y=(0.85)^x

What is the initial value for the equation y=24000(1-.08)^x

What is the percent of change for the equation y=24000(1-.08)^x

2 answers

anything to the zero power is one.
down 15% every time

1 - .08 = 0.92
down 8% every time
a.
Assuming that "initial" refers to the value of the variable = 0
(0.85)^0 = 1

b.
0.85^x shows a periodic decrease of 15%

c.
See a)

d.
well (1-.08)^x = .92^x , so what did b. tell you?