mineral=aluminite, cryptohalite, fluorannite, graphite, titanium, ziesite

Question

density (g/cm^3)=1.68, 2 1/100, 3 7/40, 2.16, 4 2/5, 3.86

1. explain why the densities cannot be represented using set-builder notation.
2. use interval notation to describe a set of numbers that contains the densities of the minerals.

Answer 1

Actually, one could use set builder notation if you defined the set Y as {1.68,2 1/100, 3 7/40, 2.16, 4 2/5, 3.86 }

Then you could say density belongs to the set Y.

It is an odd way, but it is correct.

the set interval 0<D<10 contains the densities