The table gives the height as time passes of a typical pine tree grown for lumber at a managed site.

Tree age (years)                 Height (feet)

14...............................................41

21...............................................54 

28 ..............................................64

35...............................................72 

42...............................................78

49...............................................83

If H(t) is the height of the tree after t years, construct a table of estimated values for H9 and sketch its graph.