The number of computers N t (in millions) infected by a computer virus can be approximated by N t = 2.4 1 + 15 e − 0.72 t where t is the time in months after the virus was first detected. a. Determine the number of computers initially infected when the virus was first detected. b. How many computers were infected after 6 months? Round to the nearest hundred thousand. c. Determine the amount of time required after initial detection for the virus to affect 1 million computers. Round to the nearest tenth of a month. d. What is the limiting value of the number of computers infected according to this model?
The number of computers N t (in millions) infected by a computer virus can be approximated by N t = 2.4 1 + 15 e − 0.72 t where t is the time in months after the virus was first detected. a. Determine the number of computers initially infected when the virus was first detected. b. How many computers were infected after 6 months? Round to the nearest hundred thousand. c. Determine the amount of time required after initial detection for the virus to affect 1 million computers. Round to the nearest tenth of a month. d. What is the limiting value of the number of computers infected according to this model?
The number of computers
N
t
(in millions) infected by a computer virus can be approximated by
N
t
=
2.4
1
+
15
e
−
0.72
t
where t is the time in months after the virus was first detected.
a. Determine the number of computers initially infected when the virus was first detected.
b. How many computers were infected after 6 months? Round to the nearest hundred thousand.
c. Determine the amount of time required after initial detection for the virus to affect 1 million computers. Round to the nearest tenth of a month.
d. What is the limiting value of the number of computers infected according to this model?
Mid-Term Review
Find the formula for (f + g)(x).
f(x) = x² - 10x + 25 and g(x) = x² - 10x + 24
(f + g) (x) = [ 2 ]x²
X +
DELL
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S
Calculus III
May I please have some elaborations on Example 2 part a? Thank you.
1. A bicyclist is riding their bike along the Chicago Lakefront Trail. The velocity (in
feet per second) of the bicyclist is recorded below. Use (a) Simpson's Rule, and (b)
the Trapezoidal Rule to estimate the total distance the bicyclist traveled during the
8-second period.
t
0 2
4 6 8
V
10 15
12 10 16
2. Find the midpoint rule approximation for
(a) n = 4
+5
x²dx using n subintervals.
1° 2
(b) n = 8
36
32
28
36
32
28
24
24
20
20
16
16
12
8-
4
1
2
3
4
5
6
12
8
4
1
2
3
4
5
6
Elementary Statistics: Picturing the World (7th Edition)
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