No idea where to even begin

Answer:
The answer to your question is:
a) V(12) = 1600
b) V(15) = 3200
Step-by-step explanation:
Data
V(t) = 100 2^(t/3)
Process
V(12) = 100 2^12/3
V(12) = 100 2^4
V(12) = 100 (16)
V(12) = 1600
V(15) = 100 2^(15/3)
V(15) = 100 2^5
V(15) = 100 32
V(15) = 3200