Question

How to write an expression for two-fifths of the cube of a number?

Answer 1

`2/5 xx x^3`

Explanation:

Define your number first.
Let the number be `x`

The cube of a number is `x^3`

Now we are finding a fraction of the cube of the number:

"Half of the cube" would be `1/2 xx x^3`

"Two thirds of the cube" would be `2/3 xx x^3`

"Two fifths of the cube" is `2/5 xx x^3`