#### Answer

$\{1, \frac{1}{2}, \frac{1}{4}, ... \}$
The set is infinite.
10 is not an element of the set.

#### Work Step by Step

$\{1, \frac{1}{2}, \frac{1}{4}, ... \}$
The set is infinite, because there is no last element in the set.
10 is not an element of the set because the set elements are getting smaller and smaller (divided by 2 every time, starting from 1).