$\"\"$

The phrase is

$\"\"$ . \ \

Let n = the number

The word twice the number indicates $\"\"$ . \ \

The word quotient indicates division, and the symbol is $\"\"$

The word decreased indicates subtraction, and the symbol is $\"\"$

Thus, the algebraic expression is “ $\"\"$ ”

$\"\"$ \ \

$\"\"$

The algebraic expression is $\"\"$ .