Math 233 Unit 2 Individual Project
NAME (Required): _____________________________
A computer virus is a malicious program that can cause high levels of destruction to your
computer or your mobile device. Even with an antivirus program installed, infections can still
spread very rapidly as it is restricted to detecting infections, based on information on previous
virus code. A team of experts wants to study a recently discovered computer virus by building a
mathematical model that predicts the spread of infection, even with an antivirus installed, as a
function of time.
Be sure to show your work details for all calculations and explain in detail how the answers
were determined for critical thinking questions.
1. Set up a function that represents the spread of this new computer virus during the first 25 days by
choosing a value for A, based on the first letter of your last name, from the table below. (A does
not necessarily have to be a whole number). In your equation, S(t) is the number of machines
projected to be infected and t is the time, in days.
First letter of
your last name Mathematical Model
3 Possible values for A 2 A–F S ( t )=−6 t + A t , 0 ≤t ≤ 25 161 – 180 G–L S ( t )=−8 t 3 + A t 2 , 221 – 240 0 ≤t ≤25 M–R S ( t )=−10 t 3+ A t 2 ,0 ≤ t ≤ 25 261 – 280 S–Z S ( t )=−12 t 3 + A t 2 , 0 ≤ t ≤ 25 321 – 340 State your specific function here: S ( t )=−6 t 3 + A t 2 , 0 ≤t ≤ 25 2. Using the function that you have created from #1, find the value of S(15). Show your work
details.
S ( t )=−6 t 3 + A t 2 , 0 ≤t ≤ 25 Page 1 of 3 3. Find S ' (t ) , the derivative of S(t). Show your work details and implify your answer. 4. Find the value of S ' (15) . Show your work details. 5. Interpret the meanings of S (15) and S ' (15) in the context of this virus scenario. 6. Generate a graph for S(t). (There are free downloadable programs like Graph 4.4.2 or Mathematics 4.0;
or, there are also online utilities such as this site and many others.) Insert the graph into your Word
document that contains all of your work details and answers. Be sure to label and number the
axes appropriately. (Note: Some graphing utilities require that the independent variable must be
“x” instead of “t”.) 7. After how many days is the virus projected to infect the maximum number of machines? What
maximum number of machines is projected to be infected? Show your work details for both
answers. 8. Functions are increasing on intervals where the derivative is positive and is decreasing on
intervals where the derivative is negative. Over what intervals is your function increasing and
decreasing? What do you think is the reason why the number of infected machines will start to
decrease at some point in the domain? References
Desmos. (n.d.). Retrieved from https://www.desmos.com/
Graph 4.4.2. (n.d.). Retrieved from the Graph Web site: http://www.padowan.dk/
Mathematics 4.0. (n.d.). Retrieved from the Microsoft Web site: http://microsoftmathematics.en.uptodown.com/ Page 2 of 3 Page 3 of 3

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