Tìm cực trị của hàm số z(x, y)=x^{3}+y^{3}+3xy-30

Me asap! what is the slope of this line? enter your answer in the box.

Negative 5 1/12 + negative 4 1/4 + 6 3/4

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