Pre Calculus Problem help
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Pre Calculus Problem help

[From: ] [author: ] [Date: 12-08-27] [Hit: ]
you get 20.So, a years after 1900, 20 million people have cell phones.......
I need help with this problem:
Let f(t) be the number of people, in millions, who own cell phones t years after 1990. Eplain the meaning of the following statements.

a) f(a) = 20

I also need to show the work. Thank you

-
"a" represents a number of years. When you plug in a, you get 20.
So, "a" years after 1900, 20 million people have cell phones.
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