*two function formulas were used to easily illustrate the concepts of growth and decay in applied situations.If a quantity grows by a fixed percent at regular intervals, the pattern can be depicted by these functions..I could simplify this to a decimal approximation, but I won't, because I don't want to introduce round-off error if I can avoid it.*

For example, bacteria will continue to grow over a 24 hours period, producing new bacteria which will also grow.

The bacteria do not wait until the end of the 24 hours, and then all reproduce at once.

No matter the particular letters used, the green variable stands for the ending amount, the blue variable stands for the beginning amount, the red variable stands for the growth or decay constant, and the purple variable stands for time.

Get comfortable with this formula; you'll be seeing a lot of it.

At this rate how long will it take to grow to 50,000 cells? Example: A certain animal species can double its population every 30 years.

Assuming exponential growth, how long will it take the population to grow from 40 specimens to 500? Up to this point, we have seen only exponential growth.If k is positive then we will have a growth model and if k is negative then we will have a decay model.Use the exponential growth/decay model to answer the questions.How long will it take a 150-milligram sample to decay so that only 10 milligrams are left?Answer: It takes about 1,343.5 years for a bone to lose 15% of its carbon-14. Put together a mathematical model using the initial amount and the exponential rate of growth/decay. Many math classes, math books, and math instructors leave off the units for the growth and decay rates.However, if you see this topic again in chemistry or physics, you will probably be expected to use proper units ("growth-decay constant / time"), as I have displayed above.In this case, we must determine that before we can use the model to answer the question.Step 1: Use the given information to calculate the growth/decay rate k.Note that the variables may change from one problem to another, or from one context to another, but that the structure of the equation is always the same.For instance, all of the following represent the same relationship: ..so on and so forth.

## Comments How To Solve Exponential Decay Problems

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