1960 there were 3,000 million people on earth, in 1999 there were 6,000 million people on earth, what was the approximate rate of incresse in million of people

76.9 million people each year.

Step-by-step explanation:

There was a 39 year difference between 1960 and 1999 so it would be 3000/39= 76.9

option a is correct.

step-by-step explanation:

scale factor: it is used to find proportional measurements.

proportions means having the same ratio.

scale factor is the ratio of the model measurement to the actual measurement in a simplest form.

or we can say that the ratio of any two corresponding lengths in two similar geometric figures

if the scale factor is more than 1, then it is an enlargement,

if the scale factor less than 1, then it is a reduction.

given the two geometric figure:

by definition of proportions, we have