U.S. Usage of Renewable Energy (quad BTU), 2011 to 2018
Year	Usage
2011	9.2
2012	8.05
2013	9.45
2014	9.74
2015	9.72
2016	9.99
2017	11.18
2018	11.52

(d) Use each of the three fitted trend equations to make numerical forecasts for the next three years. (Round your final answers to 2 decimal places.)

t	linear	Exponential	Quadratic
9	11.64	11.72	12.39
10	12.01	12.14	13.25
11	12.37	?	?

I need help with the spaces w/the ?