Chapter 3: Problem 68
Condense the expression to the logarithm of a single quantity. $$\log _{5} 8-\log _{5} t$$
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Chapter 3: Problem 68
Condense the expression to the logarithm of a single quantity. $$\log _{5} 8-\log _{5} t$$
These are the key concepts you need to understand to accurately answer the question.
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The management at a plastics factory has found that the maximum number of units a worker can produce in a day is \(30 .\) The learning curve for the number \(N\) of units produced per day after a new employee has worked \(t\) days is modeled by \(N=30\left(1-e^{k t}\right) .\) After 20 days on the job, a new employee produces 19 units. (a) Find the learning curve for this employee (first, find the value of \(k\) ). (b) How many days should pass before this employee is producing 25 units per day?
A philanthropist deposits 5000 in a trust fund that pays \(7.5 \%\) interest, compounded continuously. The balance will be given to the college from which the philanthropist graduated after the money has earned interest for 50 years. How much will the college receive?
Assuming that the annual rate of inflation averages \(4 \%\) over the next 10 years, the approximate costs \(C\) of goods or services during any year in that decade will be modeled by \(C(t)=P(1.04)^{t},\) where \(t\) is the time in years and \(P\) is the present cost. The price of an oil change for your car is presently 23.95 dollar. Estimate the price 10 years from now.
At 8: 30 A.M., a coroner went to the home of a person who had died during the night. In order to estimate the time of death, the coroner took the person's temperature twice. At 9: 00 A.M. the temperature was \(85.7^{\circ} \mathrm{F},\) and at 11: 00 A.M. the temperature was \(82.8^{\circ} \mathrm{F}\). From these two temperatures, the coroner was able to determine that the time elapsed since death and the body temperature were related by the formula $$t=-10 \ln \frac{T-70}{98.6-70}$$ where \(t\) is the time in hours elapsed since the person died and \(T\) is the temperature (in degrees Fahrenheit) of the person's body. (This formula comes from a general cooling principle called Newton's Law of cooling. It uses the assumptions that the person had a normal body temperature of \(98.6^{\circ} \mathrm{F}\) at death and that the room temperature was a constant \(70^{\circ} \mathrm{F}\).) Use the formula to estimate the time of death of the person.
Is it possible for a logarithmic equation to have more than one extraneous solution? Explain.
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