Four spheres of radius 6 just got inside a cylinder calculate the volume inside the cylinder that is empty

Me what is the value of x? showing work would be appreciated - ! : )

What is the 9th term in the geometric sequence described by this explicit formula? an=-6. (2)(n-1) apex

Someone answer this asap for the length, in feet, of a rectangular rug is represented by the expression 5x² + 2x. the width, in feet, is represented by the expression 3x². which expression represents the perimeter, in feet, of the rug? a. 8x² + 2x b. 8x² + 4x c. 16x² + 2x d. 16x² + 4x