10 . The relationship between two variables W and x is given by W h , k � , W � 0.
� hk x
, where
( a ) Express lnW as a linear function of x .
[ 3 ] A graph of lnW against x shows a straight line such that the gradient and the vertical intercept of the line are 0.4 and � 0.85 respectively .
( b ) Find , correct the answers to 5 significant figures , the value of
( i ) h ;
( ii ) k . [ 4 ]
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