The answer is either c or d. I would go with answer c though. sorry if it is wrong
After Greg makes the pudding 1 time, it takes him

hours to make it.
After Greg makes the pudding 2 times, it takes him

hours to make it
After Greg makes the pudding 2 times, it takes him

hours to make it
so The function is

Answer: f of x equals 2 multiplied by 0.8 to the power of x
The two numbers are 14 and 11