Question 27802
Density is only useful in determining a mass if we have an equation for volume (mass = volume * density). Is that what the {{{x^(2)+y^(2)+z^(2)}}} is an equation of? It seems this problem needs some missing details or some clarification. What is the inequality an inequality of?  What are x, y, z & a representative of (other than denisity is a function of z?  Sorry.