Bit late for an answer but here:
i: Limits of accuracy, precision to nearest cm, therefore actual is + or - 0.5 cm:
L= 14.5<-->15.5 (cm) (minX), (maxX)
W= 21.5<-->22.5 (cm) (minY), (maxY)
ii: L*W=A, find actual, minX*minY and maxX*maxY
311.75 cm^2 <--> 348.75 cm^2
2 marks! :)