What is the difference between |-3| and -3

Without graphing the linear functions, find the coordinates of the point of intersection of their graphs: y=3x−11 and y=4

Find x & pleeeeaaaassseeee me !

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?