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The relation between the number of words...

The relation between the number of words y a person learns in x hours is given by `y=52sqrt(x), 0 le x le 9`. What si the approximate number of words learned when x changes from
(i) 1 to 1.1 hour?
(ii) 4 to 4.1 hour?

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The correct Answer is:
`2.6 ~~3` words
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