7/9*18/21=?

solved and supporting work and answer in simpliest form

Which of the following properties can be used to show

Write numerical coefficient of y² in the expression 2x² - 15xy – 7y²

Acylinder with a base diameter of x units has a volume of jxcubic units which statements about the cylinder are true? check all that apply. the radius of the cylinder is 2 x units. the radius of the cylinder is 2x units. the area of the cylinder's base is 200 square units. the area of the cylinder's base is a square units. the height of the cylinder is 2x units. the height of the cylinder is 4x units. mark this and return save and exit next submit