This function will be an exponential function, because the number of rabbits double each year
the basic form for exponential functions is

where s is the starting number, c i s the constant (rate of change like double, triple, etc.) and x is the number repeats (in this case, years)

so in this case, the starting number (year 0) is 8, and the rate of change is 2
therefore, the equation is:

hope this helps!
p.s. can i have brainliest?