Question

I multiplied two inequalities in my solution. Is this allowed? http://i1084.photobucket.com/albums/j409/QRAWarrior/MATA30/MATA30Y-Attempt3.png

Answer 1

for positive x and y, then x*y <= max(x)*max(y)
x*y>= min(x)*min(y)

so it seems valid to me.