512
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32
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Answer: The placebo group serves as the control group because this group corresponds to the reference point that will be compared to the other group.
Step-by-step explanation:
The control group is a reference point in an experiment they usually never receive any treatment and serves as benchmark to compare other test result which are measured. The control groups also includes individual with similar characteristics like those been tested e.g Age, health history.
Members in a control group are usually given placebos and usually do not know that they are part of the control group. This helps the researcher determine the effectiveness of the study being carried out.
Answer:
The answer in the attached figure
Step-by-step explanation:
we have
This is a linear equation
The slope is equal to 
The y-intercept is equal to the point 
----> value of the function f(x) when the value of x is equal to zero
The x-intercept is equal to the point 
----> value of x when the value of the function is equal to zero
using a graphing tool
see the attached figure
Answer:
56.55
Step-by-step explanation:
C=2πr=2·π·9≈56.54867
