I don’t understand this can someone pls help me with it

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?

Solve this equation using substitution. {4x + y = −2} {4x + 6y = 44}

If private savings 'v' = 0.75s and total savings 's' equals $4.20 billion, solve for public and private savings.