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.
To simplify a perfect square under a radical, simply remove the radical sign and write the number that is the square root of the perfect square. For example, 121 is a perfect square because 11 x 11 is 121. Thus, you can simplify sqrt(121) to 11, removing the square root symbol.