Exam 5: Exponential and Logarithmic Functions

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Use the curve-sketching guideline, to select the graph of the function. ​ Use the curve-sketching guideline, to select the graph of the function. ​   ​

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Find the accumulated amount after 5 year(s) if $7,000 is invested at 9% compounded continuously. Round your answer to the nearest cent. ​

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Evaluate the expression. ​ Evaluate the expression. ​   __________ __________

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Use logarithms to solve the equation for t. Please round the answer to four decimal places. ​ Use logarithms to solve the equation for t. Please round the answer to four decimal places. ​   ​ t = __________ ​ t = __________

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Determine the intervals where the function Determine the intervals where the function   is decreasing. ​ is decreasing. ​

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Use the facts that Use the facts that   and   to find the value of the logarithm. Round your answer to four decimal places.  and Use the facts that   and   to find the value of the logarithm. Round your answer to four decimal places.  to find the value of the logarithm. Round your answer to four decimal places. Use the facts that   and   to find the value of the logarithm. Round your answer to four decimal places.

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Find the derivative of the function. ​ Find the derivative of the function. ​

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The Estradas are planning to buy a house 4 year(s) from now. Housing experts in their area have estimated that the cost of a home will increase at a rate of 8% / year during that 4-year period. If this economic prediction holds true, how much can they expect to pay for a house that currently costs $40,000? Round your answer to the nearest cent. ​ $__________

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Find the present value of $54,049 due in 5 year(s) at an interest rate of 7% / year compounded continuously. Round your answer to the nearest integer. ​

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Find the derivative of the function. ​ Find the derivative of the function. ​   ​

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Use logarithms to solve the equation for t. Round your answer to four decimal places. ​ Use logarithms to solve the equation for t. Round your answer to four decimal places. ​   ​ t = __________ ​ t = __________

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Online retail sales stood at $23.5 billion for 2000. For the next 2 years, they grew by 32.8% and 27.7% per year, respectively. For the next 6 years, online retail sales are projected to grow at 30.5%, 19.3%, 24.4%, 13.8%, 17.8%, and 10.3% per year, respectively. What are the projected online sales for 2008? Round your answer to the nearest tenth. ​ $__________ billion

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Suppose a radioactive substance decays according to the formula Suppose a radioactive substance decays according to the formula   . How long will it take for the substance to decay to half the original amount? ​ . How long will it take for the substance to decay to half the original amount? ​

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The length (in centimeters) of a typical Pacific halibut t years old is approximately ​ The length (in centimeters) of a typical Pacific halibut t years old is approximately ​   . ​ What is the length of a typical 5-year-old Pacific halibut? How fast is the length of a typical 5-year-old Pacific halibut increasing? What is the maximum length a typical Pacific halibut can attain? ​ . ​ What is the length of a typical 5-year-old Pacific halibut? How fast is the length of a typical 5-year-old Pacific halibut increasing? What is the maximum length a typical Pacific halibut can attain? ​

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Use the definition of a logarithm to prove Use the definition of a logarithm to prove   . .

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The height (in feet) of a certain kind of tree is approximated by The height (in feet) of a certain kind of tree is approximated by   where t is the age of the tree in years. Estimate the age of a 70-ft tree. Round your answer to the nearest hundredth. ​ __________ years where t is the age of the tree in years. Estimate the age of a 70-ft tree. Round your answer to the nearest hundredth. ​ __________ years

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Find the derivative of the function. ​ Find the derivative of the function. ​   ​

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Evaluate the expression. ​ Evaluate the expression. ​   ​

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Find the derivative of the function. ​ Find the derivative of the function. ​

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Find the second derivative of the function. ​ Find the second derivative of the function. ​

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