This algebra and precalculus video tutorial explains how to solve exponential growth and decay word problems. It provides the formulas and equations / functions that you need to solve it. This video contains plenty of examples and practice problems.

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Here is a list of example problems.
1. Population Growth of Rabbits on an island
2. Depreciation of car value
3. Appreciation of Home value
4. Exponential Growth Bacteria Problem - Finding how much will there if the bacteria doubles or triples every 20 minutes

Paul Andersen explains how populations eventually reach a carrying capacity in logistic growth. He begins with a brief discussion of population size ( N ), growth rate ( r ) and exponential growth. He then explains how density dependent limiting factors eventually decrease the growth rate until a population reaches a carrying capacity ( K ). A mathematical simulation of this process is included along with a brief discussion of r and K selected species.

Intro Music Atribution
Title: I4dsong_loop_main.wav
Artist: CosmicD
Link to sound: http://www.freesound.org/peopl....e/CosmicD/sounds/725
Creative Commons Atribution License

All images are either Public Domain or Creative Commons Attribution Licenses:
"File:Frog in Frogspawn.jpg." Wikipedia, the Free Encyclopedia. Accessed April 19, 2013. http://en.wikipedia.org/wiki/F....ile:Frog_in_frogspaw
"File:Stress-coloured Brookesia Desperata Female with Two Recently Laid Eggs.png." Wikipedia, the Free Encyclopedia. Accessed April 19, 2013. http://en.wikipedia.org/wiki/F....ile:Stress-coloured_
Nevit. English: White Rabbit, 2011. Own work. https://commons.wikimedia.org/....wiki/File:Rabbit_nev

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Coconut Value addition for textile
#valueaddition
Coconut value addition breaking in the lucrative textile industry

COCONUT VALUE ADDITION: The untapped coconut gem Kenyans aren't utilising
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Many hand dug wells dry up at the end of the dry season, because more water is taken out than is coming in by the natural recharge. Reasons of limited groundwater recharge are heavy rainfall in short time, (climate change) compact topsoil layers, erosion because of loss of vegetation, etc. Options to increase the recharge of ground water are above or underground dams, the planting of trees and plants such as vetivar grass, making contour canals etc. An other option is the so called “Tube recharge”. This low-cost option combines a manually drilled hole with a drainage tube, a filter and a small pond. Rainwater, that otherwise would run off to rivers or evaporate, thus penetrates into the ground and reaches the first aquifer.
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Farmers in Kenya are dealing with the challenges created by a changing climate by making the switch to ecological farming.