"Find the value of X and Y in the parallelogram LMNP. A. x = 31, y = 2
B. x = -3, y = 2
C. x = 2, y = 31
D. x = 124, y = 10"

Really need on these. i have no idea what to do

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?

Just tell me how to set up the equation.