Describe any five features of extensive commercial grain farming in the world.
Extensive commercial grain farming involves large-scale production of grains. The features are:
Large landholdings: Practiced over vast areas, mainly in temperate grasslands.
Mechanized farming: Uses advanced machinery for sowing, harvesting, and storage.
Low labor input: Relies on machines rather than manual labor.
Export-oriented: Produces surplus grain for export markets.
Climatic dependency: Requires specific climatic conditions like moderate rainfall and long growing seasons.
A racing track is built around an elliptical ground whose equation is given by \[ 9x^2 + 16y^2 = 144 \] The width of the track is \(3\) m as shown. Based on the given information answer the following: 
(i) Express \(y\) as a function of \(x\) from the given equation of ellipse.
(ii) Integrate the function obtained in (i) with respect to \(x\).
(iii)(a) Find the area of the region enclosed within the elliptical ground excluding the track using integration.
OR
(iii)(b) Write the coordinates of the points \(P\) and \(Q\) where the outer edge of the track cuts \(x\)-axis and \(y\)-axis in first quadrant and find the area of triangle formed by points \(P,O,Q\).