$\"\"$

The find out Length:

Perimeter of the rectangle is $\"\"$ where l is the length and w is the width.

$\"\"$ (Substitute P = 70 and w = 11)

$\"\"$ (Divide each side by 2)

$\"\"$ (Cancel common terms)

$\"\"$ (Divide: $\"\"$ ) $\"\"$

$\"\"$ (Subtract 11 from each side)

$\"\"$ (Apply commutative property: a + b = b + a)

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

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

$\"\"$ (Subtract: $\"\"$ ) $\"\"$

The length of the rectangle $\"\"$ m.