sphere 1 has a surface area of A_1

and has a volume of V_1

sphere 2 has a surface area of A_2

and has a volume of V_2

if the radius of sphere 2 is 3 times greater than the radius of sphere 1,

what is the ratio A_1/A_2 of the surface areas?

what is the ration V_1/V_2 of the volumes?

_ means that the number is underscored like this -->A_1