Which number is an irrational number?
startfraction negative 22 over 9 endfraction
negative startroot 3 endroot
2.56
startroot 15 endroot

The circumference of a redwood tree trunk is 20π ft, and it is 100 ft tall. what is the approximate volume of the redwood tree trunk? 1,000π ft3 10,000π ft3 4,000π ft3 40,000π ft3

Complete the solution of the equation. find the value of y when x equals to 6 4x+y=20

The area of a rectangle is 10 cm^2. one side of the rectangle is x cm. express the perimeter of the rectangle in terms of x and show that this rectangle cannot have a perimeter of 12 cm. the perimeter of the rectangle in terms of x is __ cm