let's check how much is it after 2 years firstly.
Brian invested the money for 6 years, so now let's check how much is that for the remaining 4 years.
equation is:
so if its even f(-x) should be equal to f(x)
that means
so f(x) is not equal to f(-x) so its not even
If its odd than f(-x) should be equal to -f(x)
so as we can see f(-x)= - f(x)
so the function is odd
Ans:function is odd and not even
Divide the previous value by 5.