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

Exponential Function?

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

Homework Statement


Species A doubles every 2 hours and initially there are 6 grams. Species B doubles every 5 hours and initially there are 14 grams.


Homework Equations





The Attempt at a Solution


I've tried graphing this, but I don't think I have the right equations down. I don't know how to form the equations so I can solve the problem.
 

Answers and Replies

  • #2
166
0
In general for 'doubling time' problems, we have a simple formula

[tex]N = N_0 \times 2^{t \over T}[/tex]

where N is the number of bacteria after t minutes and T is the time in minutes that it takes to double.

So if that's the relevant equation, attempting a solution should be possible.

EDIT: Although I don't actually know what your question is.
 
Last edited:
  • #3
537
3
I don't know how to form the equations so I can solve the problem.
You didn't even say what the problem is.
 
  • #4
20
0
*How long until the species have the same mass? Sorry.
 
  • #5
166
0
*How long until the species have the same mass? Sorry.
Okay so you know the equations by which they grow for each of them, and then you set them equal to each other and solve for t.
 

Related Threads for: Exponential Function?

  • Last Post
Replies
4
Views
780
  • Last Post
Replies
3
Views
2K
  • Last Post
Replies
1
Views
1K
  • Last Post
Replies
3
Views
1K
  • Last Post
Replies
2
Views
1K
  • Last Post
Replies
13
Views
3K
Replies
4
Views
2K
Replies
9
Views
3K
Top