If a1 = 9 and an An-1 + 1 then find the value of a4

Polygons efgh and e′f′g′h′ are shown on the coordinate grid: what set of transformations is performed on efgh to form e′f′g′h′? a. a translation 1 unit to the left followed by a 90-degree counterclockwise rotation about the origin b. a translation 1 unit to the right followed by a 90-degree counterclockwise rotation about the origin c. a 90-degree clockwise rotation about the origin followed by a translation 2 units to the right d. a 90-degree clockwise rotation about the origin followed by a translation 2 units to the left

The radius of the earth is two times the radius of the moon. what fraction of the volume of the earth is the volume of the moon?

52 cm radius = diameter = area = circumference = circumfer