Gabriela is building a brick wall. each row of bricks is 6.5\,\text{cm}6.5cm6, point, 5, space, c, m tall except that the top row is 1\,\text{cm}1cm1, space, c, m shorter because it has no mortar. she wants the wall to be 259\,\text{cm}259cm259, space, c, m tall.