Answer:

The world population at the beginning of 2019 will be of 7.45 billion people.
Step-by-step explanation:
The world population can be modeled by the following equation.

In which Q(t) is the population in t years after 1980, in billions, Q(0) is the initial population and r is the growth rate.
The world population at the beginning of 1980 was 4.5 billion. Assuming that the population continued to grow at the rate of approximately 1.3%/year.
This means that 
So


What will the world population be at the beginning of 2019 ?
2019 - 1980 = 39. So this is Q(39).


The world population at the beginning of 2019 will be of 7.45 billion people.
He missed all the other words ( if I’m wrong I’m sorry that’s what the research told me )
Answer:439.2$
Step-by-step explanation:
So first there are 52 people who use the cleaning service right? therefore lets do 52 people times the amount paid each month 12.20$ = 634.4$
16 members in the first week times 12.20 = 195.2$
so then subtract 634.4-195.2= your answer of 439.2 $ were collected the second week
Step-by-step explanation:
the second one, they are in proportion to each other in respect to the interfere values