Question

Solar panels are arrays of photovoltaic cells that convert solar radiation into electricity. the table shows the annual percent change in the US price per watt of a solar panel
Year 2004 2005 2006 2007 2008
% growth
over previous yr -5.7 6.7 9.7 -3.7 3.6

Find the largest time interval over which the actual price per watt of a solar panel was an increasing function of time.

Answer 1

I think the largest time interval over which the actual price per watt of a solar panel was an increasing function of time is : 2004 to 2006

As it gives data %growth over previous year

from 2003 to 2004 it was -5.7% but from 2004 to 2005 6.7 % from 2005 to 2006 it is 97 % and from there it once again decline

hope this helps