• Support PF! Buy your school textbooks, materials and every day products Here!

Word Problem

  • Thread starter jackleyt
  • Start date
  • #1
20
0

Homework Statement


The population of a country is growing exponentially. The population in millions was 120 in 1970 and 150 in 1980.

(a) What is the population t years after 1970?

(b) How long does it take the population to double?

(c) When will the population be 400 million?



Homework Equations





The Attempt at a Solution


I don't know how to start the equation, so I listed out the years and the populations to no avail.
 

Answers and Replies

  • #2
15
0
I'll give you the equation you need to use.

P(t) = P0ekt

P(0) = P0

Use the information given in the problem to find your constant (k). Once you have that it is very easy.

Cool, first post!
 

Related Threads for: Word Problem

  • Last Post
Replies
5
Views
2K
  • Last Post
Replies
1
Views
696
  • Last Post
Replies
7
Views
2K
  • Last Post
Replies
17
Views
2K
  • Last Post
Replies
8
Views
1K
  • Last Post
Replies
1
Views
843
  • Last Post
Replies
7
Views
1K
  • Last Post
Replies
5
Views
8K
Top