Refer to figure.
(1) Enter the graph at a temperature of 30°C. Draw a vertical line up and intersect the 1000 ft Pressure Altitude reference line. Continue horizontally to the right until the the Mass "REFERENCE LINE".
(2) From this point, following the reference lines, continue diagonally slightly down and to the right until you intersect the reference line corresponding to 3450 lb.
(3) Now, continue horizontally to the right to the Wind Reference Line. Apply the wind correction of 2.5 kt tailwind, by drawing a diagonal line up and to the right.
(4) Continue horizontally to the right until the next Reference line. Since the question is asking for the landing distance from a height of 50 ft - we must continue diagonally up and to the right following the reference lines. Read a result of approximately 2450 ft.