The bacteria Streptococcus pneumoniae (S. pneumoniae) is the cause of many human diseases, the most common being pneumonia. A culture of these bacteria initially has 10 bacteria and increases at a rate of 25% per hour. (a) Find the hourly growth factor a. a = Find an exponential model f(t) = Cat for the bacteria count in the sample, where t is measured in hours. f(t) = (b) Use the model you found to predict the number of bacteria in the sample after 4 hours. (Round your answer to the nearest whole number.) bacteria Laurence Gough/Shutterstock.com 2009

Calculus: Early Transcendentals
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ISBN:9781285741550
Author:James Stewart
Publisher:James Stewart
Chapter1: Functions And Models
Section: Chapter Questions
Problem 1RCC: (a) What is a function? What are its domain and range? (b) What is the graph of a function? (c) How...
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**Bacterial Growth of Streptococcus pneumoniae**

The bacteria *Streptococcus pneumoniae* (*S. pneumoniae*) is the cause of many human diseases, the most common being pneumonia. A culture of these bacteria initially has 10 bacteria and increases at a rate of 25% per hour.

---

**Tasks:**

**(a) Calculate the Hourly Growth Factor:**

Determine the growth factor per hour.
\[ a = \_\_\_ \]

**Exponential Model for Bacteria Count:**

Develop an exponential model \( f(t) = Ca^t \) for the bacteria count in the sample, where \( t \) is measured in hours.
\[ f(t) = \_\_\_ \]

**(b) Predict Bacteria Count After 4 Hours:**

Using the model found, estimate the number of bacteria in the sample after 4 hours. (Round your answer to the nearest whole number.)
\[ \_\_\_ \text{ bacteria} \]

*Image Description:* A scientist, in a lab setting, appears to be handling a laboratory apparatus, possibly related to the study or cultivation of bacterial samples.
Transcribed Image Text:**Bacterial Growth of Streptococcus pneumoniae** The bacteria *Streptococcus pneumoniae* (*S. pneumoniae*) is the cause of many human diseases, the most common being pneumonia. A culture of these bacteria initially has 10 bacteria and increases at a rate of 25% per hour. --- **Tasks:** **(a) Calculate the Hourly Growth Factor:** Determine the growth factor per hour. \[ a = \_\_\_ \] **Exponential Model for Bacteria Count:** Develop an exponential model \( f(t) = Ca^t \) for the bacteria count in the sample, where \( t \) is measured in hours. \[ f(t) = \_\_\_ \] **(b) Predict Bacteria Count After 4 Hours:** Using the model found, estimate the number of bacteria in the sample after 4 hours. (Round your answer to the nearest whole number.) \[ \_\_\_ \text{ bacteria} \] *Image Description:* A scientist, in a lab setting, appears to be handling a laboratory apparatus, possibly related to the study or cultivation of bacterial samples.
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