Anxiety Disorder Statistics. Anxiety Disorders affect 18.1 percent of adults in the United States (approximately 40 million adults between the ages of 18 to 54).
Perfect square. Perfect square is an element of algebraic structure which is equal to the square of another element. Square number, a perfect square integer.
Simplify any radical expressions that are perfect squares. A perfect square is the product of any number that is multiplied by itself, such as 81, which is the product of 9 x 9.