Find the area of the circular hole for an air duct that is to be cut from a wall if the diameter of the duct is 5.2 inches, what is the area of the circular hole?

Which of the following represents a number squared is equal to twenty more than nine times that number ? a) x squared = 9x + 20 b) x squared = 20x + 9 c) x squared > 9 + 20x d) x squared = 9 + x + 20

Two corresponding sides of two similar triangles are 3cm and 5cm. the area of the first triangle is 12cm^2. what is the area of the second triangle?

Bring the fraction a/a-4 to a denominator of 16-a^2