$\"\"$ $\"\"$

The sentence is “Twenty five is 10 less than a number”

Let n be the number

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

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

The equation is $\"\"$ . $\"\"$

Addition property of equality: Add 10 to each side.

$\"\"$ (Add 10 to each side)

$\"\"$ (Apply additive inverse property: $\"\"$ )

$\"\"$ (Apply additive identity property: $\"\"$ )

$\"\"$ (Add: $\"\"$ ) $\"\"$

The value of the expression is 35.