What is 3х - 4<-19=

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

Write the expression as a single natural logarithm. 2 in a - 4 in y

Let x = a + bi and y = c + di and z = f + gi. which statements are true?