Let N- f(t) be the number of households (in millions) that use a \'land-line\' t

Question

Let N- f(t) be the number of households (in millions) that use a 'land-line' telephone in their home, where t is the number of years since 1995. In 1995, almost all households had a land-line telephone. By 2005 a small number of households had giving up their land-line and were relying entirely on cell-phones and internet based phone services such as Skype, but more and more households were giving up their land-line telephone service each year. Choose the best expression to match this statement. O f (10) > 0 and f" (10)

Explanation / Answer

Here f(t) has decreased after 10 years so f'(10) is negative but rate of decrease is increasing every every year so f"(10) is postive hence the second option is the correct one.

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