{1+8+27+64+125...} find the next 9 terms

Atoy company is considering a cube or sphere-shaped container for packaging a new product. the height of the cube would equal the diameter of the sphere . compare the volume to surface area ratios of the containers. which packaging will be more efficient? for a sphere, sa =4πr²

How do you solve a question like this?

Acomputer store bought a program at a cost of $10 and sold it for $13. find the percent markup