Answer
Initial Amount: 0.1
Decay Factor: 0.9
Work Step by Step
To find the initial amount, plug 0 in for x:
y = 0.1 (0.9)$^{x}$
y = 0.1 (0.9)$^{0}$
y = 0.1 (1)
y = 0.1
0.9 is the decay factor because this is the value that is attached to the "x" exponent. In other words, this is the value that will determine by how much x decays.
