Evaluate cot0 if sin0= square root of 6/5

Geometry ? i don't know how to do any of these.

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?

15 and 14.7 are 1 apart, so 15 – 14.7 must be 1.