Don’t know what the answer is pls help

Find the value of tan theta if sin theta = 12/13 and theta is in quadrant 2

Name the most appropriate metric unit for each measurement like the mass of cow

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?