Can some one help me on this question please and thank you

Which of the following of the following sets of side lengths could not form a triangle?

Let the mean of the population be 38 instances of from 6" - 9" hatchings per nest, and let the standard deviation of the mean be 3. what sample mean would have a confidence level of 95% or a 2.5% margin of error?

Taking algebra two apex courses and need with these questions