Chapter 4: Problem 76
Write each equation as an equivalent logarithmic equation. $$w=b^{k}$$
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Chapter 4: Problem 76
Write each equation as an equivalent logarithmic equation. $$w=b^{k}$$
These are the key concepts you need to understand to accurately answer the question.
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Use the following definition. In chemistry, the \(\mathrm{pH}\) of a solution is defined to be $$\mathrm{pH}=-\log \left[H^{+}\right],$$ where \(H^{+}\) is the hydrogen ion concentration of the solution in moles per liter. Distilled water has a pH of approximately 7. A substance with a pH under 7 is called an acid, and one with a pH over 7 is called a base. The hydrogen ion concentration of orange juice is \(10^{-3.7}\) moles per liter. Find the pH of orange juice.
Power Rule Applying the power rule to \(y=\log \left(x^{2}\right)\) yields \(y=2 \cdot \log (x),\) but are these functions the same? What is the domain of each function? Graph the functions. Find another example of a function whose domain changes after application of a rule for logarithms.
Economic Impact An economist estimates that \(75 \%\) of the money spent in Chattanooga is respent in four days on the average in Chattanooga. So if \(P\) dollars are spent, then the economic impact \(I\) in dollars after \(n\) respendings is given by $$I=P(0.75)^{n}$$ When \(I <0.02 P,\) then \(P\) no longer has an impact on the economy. If the Telephone Psychics Convention brings \(\$ 1.3\) million to the city, then in how many days will that money no longer have an impact on the city?
Solve each problem. Global Warming The increasing global temperature can be modeled by the function $$I=0.1 e^{0.02 t}$$ where \(I\) is the increase in global temperature in degrees Celsius since \(1900,\) and \(t\) is the number of years since 1900. a. How much warmer was it in 2010 than it was in \(1950 ?\) b. In what year will the global temperature be \(4^{\circ}\) greater than the global temperature in \(2000 ?\)
Solve each equation. Find the exact solutions. $$\log _{32}(64)=x$$
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