93. Online Banking. In 2000, about 39.4 million
American households conducted at least some of
their banking online. By 2010, that number had
risen to about 72.5 million. Let N (t) represent the
number of American households using online
banking, in millions, t years after 2000.
a) Find a linear function that fits the data.
b) Use the function of part (a) to predict the num-
ber of American households that will use online
banking in 2015.
c) In what year will 157 million American house-
holds use online banking?
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