Chapter 3: Problem 6
Express each equation in logarithmic form. $$\left(\frac{1}{2}\right)^{-4}=16$$
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Chapter 3: Problem 6
Express each equation in logarithmic form. $$\left(\frac{1}{2}\right)^{-4}=16$$
These are the key concepts you need to understand to accurately answer the question.
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The temperature of a cup of coffee \(t\) min after it is poured is given by $$ T=70+100 e^{-0.0446 t} $$ where \(T\) is measured in degrees Fahrenheit. a. What was the temperature of the coffee when it was poured? b. When will the coffee be cool enough to drink (say, \(\left.120^{\circ} \mathrm{F}\right) ?\)
Sketch the graph of the equation. $$y=\log _{1 / 3} x$$
The concentration of a drug in an organ at any time \(t\) (in seconds) is given by $$ x(t)=0.08+0.12 e^{-0.02 t} $$ where \(x(t)\) is measured in grams/cubic centimeter \(\left(\mathrm{g} / \mathrm{cm}^{3}\right)\). a. How long would it take for the concentration of the drug in the organ to reach \(0.18 \mathrm{~g} / \mathrm{cm}^{3}\) ? b. How long would it take for the concentration of the drug in the organ to reach \(0.16 \mathrm{~g} / \mathrm{cm}^{3}\) ?
On the basis of data collected during an experiment, a biologist found that the growth of a fruit fly (Drosophila) with a limited food supply could be approximated by the exponential model $$ N(t)=\frac{400}{1+39 e^{-0.16 t}} $$ where \(t\) denotes the number of days since the beginning of the experiment. a. What was the initial fruit fly population in the experiment? b. What was the population of the fruit fly colony on the 20th day?
Use the laws of logarithms to solve the equation. $$\log _{5}(2 x+1)-\log _{5}(x-2)=1$$
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