$\"\"$

The sentence is twice a number decreased by the cube of the same number.

Let n be the number

The word “twice” indicates multiplication by 2. So, twice a number is 2n

The word “decreased” indicates subtraction and the symbol is “ $\"\"$ ”.

$\"\"$

Rewrite the sentence into expression as,

$\"\"$

= $\"\"$

$\"\"$

The algebraic expression is $\"\"$ .