Write your answers in the spaces provided. Show the steps of solution, otherwise full marks will not be given. 6. The height of an add-on shelf is measured as 40 cm using a measuring tape. It is given that the percentage error is 0.625% and the scale interval of the measuring tape is 2x cm. (a) Find the value of .x. (b) (3 marks) Is it possible that the actual total height of two identical add-on shelves is 0.798 m? Explain your answer. (3 marks)