10.6 Exponential Growth and Decay Answer Key

In the realm of mathematics, the concept of exponential growth and decay forms a fundamental cornerstone. Within this comprehensive guide, we will unravel the intricacies of exponential growth and decay, exploring their properties, applications, and problem-solving techniques. To solidify your understanding, we will also provide a set of practice problems along with detailed answer explanations.

Understanding Exponential Growth and Decay

Exponential growth and decay are natural phenomena observed in various real-world scenarios, from population growth to radioactive decay. These processes follow a distinct pattern: exponential growth results in an ever-accelerating increase, while decay leads to a steady decrease over time.

Key Properties of Exponential Growth and Decay

  1. Growth Factor and Decay Factor: Central to these processes is the notion of growth and decay factors. A growth factor greater than 1 signifies exponential growth, whereas a decay factor between 0 and 1 represents exponential decay.
  2. Time Constant: The time constant is a vital parameter that dictates the rate of growth or decay. It determines how quickly the quantity changes over time.

Skill 1: Exponential Growth Problems

To master the art of exponential growth, consider the following example:

If an investment grows at a rate of 8% annually and starts with $5,000, calculate its value after 10 years.

Answer: The investment will be approximately $10,794.62 after 10 years.

Skill 2: Exponential Decay Problems

Now, let’s tackle an exponential decay scenario:

A sample of a radioactive element decays at a rate of 12% per year. If the initial amount was 500 grams, determine the amount remaining after 30 years.

Answer: The remaining amount of the radioactive element will be about 73.40 grams after 30 years.

Practice Problems and Answers

To test your proficiency, here are a few practice problems:

  1. A population of bacteria doubles every 3 hours. If the initial population is 100 bacteria, what will be the population after 12 hours?
    Answer: The population will be 1600 bacteria after 12 hours.
  2. An artifact’s value decreases by 15% each year. If its initial value is $800, what will be its value after 5 years?
    Answer: The artifact’s value will be approximately $238.20 after 5 years.

Mastering Exponential Growth and Decay: Your Gateway to Applied Mathematics

As you delve deeper into the intricacies of exponential growth and decay, you uncover a powerful tool for understanding dynamic processes in various fields. From finance to science, these concepts serve as invaluable analytical tools.

In conclusion, exponential growth and decay are foundational principles that govern diverse natural and artificial processes. By grasping their properties, mastering the associated calculations, and tackling practice problems, you elevate your mathematical prowess. Armed with the insights gained from this guide and the answers provided, you’re well-prepared to navigate the world of exponential growth and decay with confidence.

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