You start by cross multiplying: 9 x 8 = 72 This is considered the fraction on the left's value. You do the same for the other side: 10 x 7 = 70 This is considered the value of the fraction 7/8 72 has a greater value than 70.
<span>If you know that a single point is closed (as a set), then any finite set is closed because they are finite unions of closed (single point) sets.</span>
