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(a)

Plot the points and obtain the regression equation using Excel-sheet.

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The logaritm function is $\"\"$ .

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(b)

Predict the number of word families.

The regerssion equation is $\"\"$ .

Since word families that make up $\"\"$ , $\"\"$ .

Substitute $\"\"$ in above exponential equation.

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Definition of logarithm : $\"\"$ if and only if $\"\"$ .

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Number of word families are $\"\"$ .

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(a) The logaritm function is $\"\"$ .

(b) Number of word families are $\"\"$ .