X=a
f(a)=5(a^0)+4a^-3 a^0=1
=5(1)+4/a^3
=5+4/(a^3)
Since the logarithmic function is the inverse of the exponential function, the domain of the logarithmic function is the range of the exponential function and that works the same both ways.
We know that 15 elves represent the 20% of the total.
Since 20% is one-fifth, the total number of elves is

Alternatively, solve the proportion

which yields

Answer:
I think its the first and the third one
Step-by-step explanation:
lemme know if this helps :)