Answer:
D. 32
Step-by-step explanation:
For this problem, we simply plug -9 in for x in f(x):
⇒ 
Thus, the answer is D. 32.
Hope this helps!
Could you maybe add more info? like a story or something
Firstly, let's take first factor:
(y^3)^2 = y^(3*2) = y^6
and then:
y^6 * y^7 = y^(6 + 7) = y^13
The formula for yearly compound interest is A(1 + r)^t
Where is A = 1000, r = 8%, t = 20

The answer is $4660.96