What is a number that is multiplied by itself to form a product?

Identify the parent function that can be used to graph the function f(x)= (1/4x)^3

Four individuals pool money together to start a new business and agree to split the profits equally. n invests $6,000, x invests $2,000, y invests $8,000 and z invests $4,000. if the profits for the first month were $100,000, y receives than if the profits were divided in proportion to how much they invested.

Asap! i'm not good math and i'm lost.