I need help finding what the answers are in the empty spaces? Anyone willing to help me find them or tell me?

What is the relationship between all triangles that can be drawn given the same three angles

Weekly wages at a certain factory are normally distributed with a mean of $400 and a standard deviation of $50. find the probability that a worker selected at random makes between $450 and $500

List x1, x2, x3, x4 where xi is the midpoint endpoint of the five equal intervals used to estimate the area under the curve of f(x) between x = 0 and x = 10.