dy dt - -6y, y(0) = 4

Calculus: Early Transcendentals
8th Edition
ISBN:9781285741550
Author:James Stewart
Publisher:James Stewart
Chapter1: Functions And Models
Section: Chapter Questions
Problem 1RCC: (a) What is a function? What are its domain and range? (b) What is the graph of a function? (c) How...
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Problem Set 6.5
In Problems 1-4, solve the given differential equation subject to
the given condition. Note that y(a) denotes the value of y at t = a.
-6y. y(0) = 4
1.
3.
4.
5 31 313
dy
di
dy
dt
dy
dt
0.005 y, y(10) = 2
-0.003 y. y(-2) = 3
2.
dy
dt
=
6y, y(0) = 1
5. A bacterial population grows at a rate proportional to its
size. Initially, it is 10,000, and after 10 days it is 20,000. What is the
population after 25 days? See Example 2.
6. How long will it take the population of Problem 5 to dou-
ble? See Example 1.
7. How long will it take the population of Problem 5 to
triple? See Example 1.
8. The population of the United States was 3.9 million in
1790 and 178 million in 1960. If the rate of growth is assumed pro-
portional to the number present, what estimate would you give
for the population in 2000? (Compare your answer with the ac-
tual 2000 population, which was 275 million.)
at 3.2%
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Transcribed Image Text:Problem Set 6.5 In Problems 1-4, solve the given differential equation subject to the given condition. Note that y(a) denotes the value of y at t = a. -6y. y(0) = 4 1. 3. 4. 5 31 313 dy di dy dt dy dt 0.005 y, y(10) = 2 -0.003 y. y(-2) = 3 2. dy dt = 6y, y(0) = 1 5. A bacterial population grows at a rate proportional to its size. Initially, it is 10,000, and after 10 days it is 20,000. What is the population after 25 days? See Example 2. 6. How long will it take the population of Problem 5 to dou- ble? See Example 1. 7. How long will it take the population of Problem 5 to triple? See Example 1. 8. The population of the United States was 3.9 million in 1790 and 178 million in 1960. If the rate of growth is assumed pro- portional to the number present, what estimate would you give for the population in 2000? (Compare your answer with the ac- tual 2000 population, which was 275 million.) at 3.2% wh or rer aft bo of do fre 51 in wil bro mi per min pla the
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