Need geometry help please

What is the nth term rule of the linear sequence below? 27 , 25 , 23 , 21 , 19 , . .

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?

Select the quadratic that has root x = 8 and x = -5