$\"\"$

The word $\"\"$ quotient $\"\"$ indicates division operation and its symbol is $\"\"$ .

The word $\"\"$ is at most $\"\"$ indicates is less than or equal and its symbol is $\"\"$ .

The word $\"\"$ The quotient of a number t and 4.2 $\"\"$ indicates the expression is $\"\"$ .

The word $\"\"$ The quotient of a number t and 4.2 is at most 15 $\"\"$ indicates the expression is $\"\"$ . $\"\"$

The inequality is $\"\"$ .