Dear Rosabella09: For 9- Two possible dimensions are 8x15 and 10x20.
For 10- 16(8+18)1/2=208 208-(16x8/2)=208-64= [144 squared feet]
Answer:
The populaton in year 1991 will be of 5178.9 million of people
and the population in year 2020 will be of 8524.60 million of people
Step-by-step explanation:
We measure the time t in years and let t=0 in the year 1950.
We measure the population P(t) in millions of people, then P(0)=2560 and P(10) = 3040.
Since we are assuming that dp/dt=kP, this theorem gives the following.



The relative growth rate is about 1.7% per year and the model is

<em>Year 1991 is equal in our formula to 41 and year 2020 is equal to 70. </em>Replacing,


Therefore the populaton in year 1991 will be of 5178.9 million of people and the population in year 2020 will be of 8524.60 million of people