Every year Nyachang determines the average height of the trees in her backyard, as shown in the table below. Years Since Planting Average Height (ft) 1 9.5 13 4 15 16.5 17.5 7 18.5 8 19 6. 19.5 10...

a.What is the average height of these trees 20years after in the nearest tenth of a foot will be

b.Determine the number of years it will take  for the tree to reach 30 feet

Extracted text: Every year Nyachang determines the average height of the trees in her backyard, as shown in the table below. Years Since Planting Average Height (ft) 1 9.5 13 4 15 16.5 17.5 7 18.5 8 19 6. 19.5 10 19.7 11 19.8 These data can be modelled by a logarithmic regression function of the form h = a+ b• In t where h is the average height of the trees after tyears.