Try It 10.88: Evaluating an Exponential Decay Model
Practice solving an exponential decay problem by determining the decay rate and applying it to find a future amount. Suppose a bacteria population declines from to in hours. Using the exponential decay formula , substitute the given values: . Dividing by gives . Taking the natural logarithm of both sides results in , so the decay rate is . To find the population after hours, use this rate in the formula: . Evaluating this expression yields approximately . Thus, there will be about bacteria remaining.
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Ch.10 Exponential and Logarithmic Functions - Intermediate Algebra @ OpenStax
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Try It 10.87: Evaluating an Exponential Growth Model
Try It 10.88: Evaluating an Exponential Decay Model
As a data analyst forecasting the exponential growth of your company's new software platform, you need to project the future number of active users. Recall the standard procedure for solving an exponential growth application and arrange the following mathematical steps in the correct order.
A logistics company is monitoring the growth of its delivery fleet. The number of vehicles is growing exponentially following the formula , where is the final amount, is the initial amount, is the growth rate, and is the time in years. If the company started with 50 vehicles and now has 150 vehicles after 3 years, which equation is correctly set up to solve for the growth rate ?
As a cloud infrastructure analyst, you use the exponential growth formula to project future data storage requirements for your organization. Match each mathematical component of the formula with its corresponding role in this capacity planning scenario.
In a professional growth analysis using the exponential model , if the growth rate constant is unknown, it is necessary to first calculate the value of using current data before you can determine the projected future amount .
Procedural Steps in Exponential Growth Forecasting
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A public health inspector is monitoring the effectiveness of a sanitization process in a food production facility using the exponential decay model . A sample of bacteria measured at 700,000 units was treated and found to decline to 400,000 units after 5 hours. Match each variable from the formula to its corresponding value or description from this scenario.
As a quality assurance analyst, you are monitoring the degradation of a chemical additive in a new product. The additive's concentration decays continuously from 700,000 parts per billion down to 400,000 parts per billion over a period of 5 months. Recalling the continuous exponential decay formula, , which equation shows the correct initial setup to determine the decay rate ?
A public health technician is monitoring a sanitization process where a bacteria population declines from 700,000 to 400,000 units in 5 hours. To predict the population remaining after 24 hours using the model , arrange the following steps in the correct order.
A laboratory technician is evaluating the decline of a bacterial culture using the exponential decay model . After substituting the initial and final population values into the formula, the technician must apply the ____ logarithm to both sides of the equation to solve for the decay rate .
A laboratory technician is monitoring a bacterial culture that declines from 700,000 to 400,000 units over a period of 5 hours. To model this decline using the exponential decay formula , True or False: The value 700,000 should be substituted for the variable (initial amount) and the value 400,000 should be substituted for the variable (final amount).