Chapter 3: Problem 18
write each equation in its equivalent logarithmic form. $$b^{3}=343$$
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Chapter 3: Problem 18
write each equation in its equivalent logarithmic form. $$b^{3}=343$$
These are the key concepts you need to understand to accurately answer the question.
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The August 1978 issue of National Geographic described the 1964 find of bones of a newly discovered dinosaur weighing 170 pounds, measuring 9 feet, with a 6 -inch claw on one toe of each hind foot. The age of the dinosaur was estimated using potassium- 40 dating of rocks surrounding the bones. a. Potassium-40 decays exponentially with a half-life of approximately 1.31 billion years. Use the fact that after 1.31 billion years a given amount of potassium- 40 will have decayed to half the original amount to show that the decay model for potassium-40 is given by \(A=A_{0} e^{-0.52912 t}\) where \(t\) is in billions of years. b. Analysis of the rocks surrounding the dinosaur bones indicated that \(94.5 \%\) of the original amount of potassium-40 was still present. Let \(A=0.945 A_{0}\) in the model in part (a) and estimate the age of the bones of the dinosaur.
Solve each exponential equation by expressing each side as a power of the same base and then equating exponents. $$5^{x}=625$$
The formula \(A=37.3 e^{0.0095 t}\) models the population of California, \(A,\) in millions, \(t\) years after 2010 . a. What was the population of California in \(2010 ?\) b. When will the population of California reach 40 million?
Use your graphing utility to graph each side of the equation in the same viewing rectangle. Then use the \(x\) -coordinate of the intersection point to find the equation's solution set. Verify this value by direct substitution into the equation. $$2^{x+1}=8$$
By 2019 , nearly 1 dollar out of every 5 dollars spent in the U.S. economy is projected to go for health care. The bar graph shows the percentage of the U.S. gross domestic product (GDP) going toward health care from 2007 through 2014 , with a projection for 2019.(GRAPH CAN'T COPY). The data can be modeled by the function \(f(x)=1.2 \ln x+15.7\) where \(f(x)\) is the percentage of the U.S. gross domestic product going toward health care \(x\) years after \(2006 .\) Use this information to solve. a. Use the function to determine the percentage of the U.S. gross domestic product that went toward health care in \(2008 .\) Round to the nearest tenth of a percent. Does this underestimate or overestimate the percent displayed by the graph? By how much? b. According to the model, when will \(18.6 \%\) of the U.S. gross domestic product go toward health care? Round to the nearest year.
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