Answer
The answer and procedures of the exercise are attached in the following archives.
Step-by-step explanation:
You will find the procedures, formulas or necessary explanations in the archive attached below. If you have any question ask and I will aclare your doubts kindly.
Πr^2=area 9=r 9^2=81π=254.47
With 'random sampling' every item in the population has an equal probability of being selected.
If you're finding slope, the answer is 5/3