Again, the subsets of a set is the sets within a set so they are:
{4}, {6}, {8}, {9}, {10}, {4,6}, {4,8}, {4,9}, {4,10}, {6,8}, {6,9}, {6,10}, {8,9}, {8,10}, {9,10}, {4,6,8}, {4,6,9}, {4,6,10}, {4,8,9}, {4,8,10}, {4,9,10}, {6,8,9}, {6,8,10}, {6,9,10}, {8,9,10}, {4,6,8,9}, {4,6,8,10}, {4,6,9,10}, {4,8,9,10}, {6,8,9,10} ,{4,6,8,9,10}, { }.
There are 32 subsets, since the number of subsets of a set with n terms is 2^n