Section 6.8 Exponential Growth and Decay Models; Newton’s Law; Logistic Growth and Decay Models.

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Presentation transcript:

Section 6.8 Exponential Growth and Decay Models; Newton’s Law; Logistic Growth and Decay Models

OBJECTIVE 1

A colony of bacteria grows according to the law of uninhibited growth according to the function where N is measured in grams and t is measure in days.

A colony of bacteria increases according to the law of uninhibited growth. (a)If the number of bacteria doubles in 4 hours, find the function that gives the number of cells in the culture. (b)How long will it take for the size of the colony to triple? (c)How long will it take for the population to double a second time (that is increase four times)?

OBJECTIVE 2

OBJECTIVE 3

An object is heated to 75°C and is then allowed to cool in a room whose air temperature is 30°C. (a) If the temperature of the object is 60° after 5 minutes, when will its temperature be 50°? (b) Using a graphing utility, graph the relation found between the temperature and time. (c) Using a graphing utility, verify the results from part (a). (d)Using a graphing utility, determine the elapsed time before the object is 35°C. (e) What do you notice about the temperature as time passes?

OBJECTIVE 4