Gabriella is building a brick wall each row of bricks is 6.5 cm tall except that the top row is 1 cm shorter because it has no motor she wants the wall to be 259 cm tall. Which equation camera use to determine r, the number of rows of bricks Gabriela needs in her wall. A: 6.5(r-1) = 259
B: 6.5r - 1 = 259
C: 6.5r - r = 259
D: 6.5(r-1)+1=259