Expert: Sherman D. - 2/25/2006

Question
Could you please help me with the following problems:

Word Problem:
As the use of the Internet increases, so has the number of computer infections from viruses.  The function
     N(x) = 0.2x^2 - 1.2x +2
models the number of infections per month for every 1000 computer, N(x), x years after 1990.  Find and interpet N(10).

Question #2.  The instructions are:  Use this function to find and interpret each:

 T(70,000)


Thanks,
Jean

Answer
1.)
N(x) = .2x^2 - 1.2x + 2
or
N(x) = .2(x^2 - 6x + 10)

N(10) = .2(10^2 - 6(10) + 10)
N(10) = .2(100 - 60 + 10)
N(10) = .2(40 + 10)
N(10) = .2(50)
N(10) = 10 infections by the year 2000

--------------------------------------

2.) Assuming i understand this
70000 computers = N(70)

N(70) = .2(70^2 - 6(70) + 10)
N(70) = .2(4900 - 420 + 10)
N(70) = .2(4480 + 10)
N(70) = .2(4490)
N(70) = 898 infections by the year 2060

I am not 100% certain on this, because i don't know what you mean by the T in T(70,000). Unless you mean 70000 computer, and since it for every 1000 computer, i just divided 70000 by 1000 and got 70