17 . R is defined to be the region bounded by the lines x -axis and the y -axis y
0.25 x
�e � 1.25 , y � 8
, the
( a ) ( i ) Show that x�4ln ( y� 1.25 ) .
( ii ) Hence , find the area of R .
[ 5 ] A solid model is formed by rotating the region R through 2� about the y -axis.
( b ) Find the volume of the solid model . [ 2 ]
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