The equation which correctly models the situation in discuss is; P = 2.5(1.012)^y.
If follows from the task content that the situation given is that The number of people in the world was 2.5 billion in 1950.
Afterwards, The population has grown by 1.2% each year since then. Hence it follows that the function is an exponential one whose factor is; (100+1.2)%= 1.012.
Read more on exponential functions;
https://brainly.com/question/1979778
#SPJ1