Answer:
0.13
Explanation:
The exponential function has the following form:
[tex]y=a\cdot(1-r)^t[/tex]Where a is the initial value and r is the decay rate.
In this case, we have:
[tex]y=15000(0.87)^t[/tex]So, we can say that 0.87 is equal to 1 - r, then:
0.87 = 1 - r
Now, we need to solve the equation for r:
0.87 + r = 1 - r + r
0.87 + r = 1
0.87 + r - 0.87 = 1 - 0.87
r = 0.13
Therefore, the decay rate is 0.13.
