Answer: The 1st one is 1 soultion the 2nd one is 1 soultion the 3rd one is multiple soultion and the last one is multiple solution
Step-by-step explanation: hope I am right?
The difference between the circumference of circle X and circumference of circle Y is 5π cm.
<h3>What is circumference of a circle?</h3>
This is the distance round a circle.
The circumference of circle X is calculated as follows;

The circumference of circle Y is calculated as follows;

The difference between the circumference of circle X and circumference of circle Y is calculated as follows;

Thus, the difference between the circumference of circle X and circumference of circle Y is 5π cm.
Learn more about circumference of a circle here: brainly.com/question/9782777
Answer:
She should earn 225 dollars.
Step-by-step explanation:
I know this because 50 ÷ 4 = 12.5 and 12.5 × 18 = 225.
Answer:
Margin of error for a 95% of confidence intervals is 0.261
Step-by-step explanation:
<u>Step1:-</u>
Sample n = 81 business students over a one-week period.
Given the population standard deviation is 1.2 hours
Confidence level of significance = 0.95
Zₐ = 1.96
Margin of error (M.E) = 
Given n=81 , σ =1.2 and Zₐ = 1.96
<u>Step2:-</u>
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On calculating , we get
Margin of error = 0.261
<u>Conclusion:-</u>
Margin of error for a 95% of confidence intervals is 0.261
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