What is the greatest common factor of 16 and 48?

Kylie explained that (-4x+9)^2 will result in a difference of squares because (-4x+9)^2 (-4x+9)^2 =(-4x)^2+(9)^2=16x^2+81

Atriangle with all sides of equal length is a/an triangle. a. right b. scalene c. equilateral d. isosceles

Witch represents the inverse of the function f(x)=1/4x-12