Exam 4: Exponential and Logarithmic Functions

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​Write the equation of the line tangent to the curve ​Write the equation of the line tangent to the curve   at the point (2,1). ​ at the point (2,1). ​

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​The relationship between the number of decibels β and the intensity of a sound I in watts per square centimeter is given by ​The relationship between the number of decibels β and the intensity of a sound I in watts per square centimeter is given by   Find the rate of change in the number of decibels when the intensity is   watt per square centimeter.Round your answer to the nearest decibel. Find the rate of change in the number of decibels when the intensity is ​The relationship between the number of decibels β and the intensity of a sound I in watts per square centimeter is given by   Find the rate of change in the number of decibels when the intensity is   watt per square centimeter.Round your answer to the nearest decibel. watt per square centimeter.Round your answer to the nearest decibel.

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Use a graphing utility to graph the function Use a graphing utility to graph the function   ​ ​ ​ ​

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Suppose that the annual rate of inflation averages 4% over the next 10 years.With this rate of inflation,the approximate cost C of goods or services during any year in that decade will be given by Suppose that the annual rate of inflation averages 4% over the next 10 years.With this rate of inflation,the approximate cost C of goods or services during any year in that decade will be given by   ,   where t is time in years and P is the present cost.If the price of an oil change for your car is presently $25.95,estimate the price 10 years from now.Round your answer to two decimal places. , Suppose that the annual rate of inflation averages 4% over the next 10 years.With this rate of inflation,the approximate cost C of goods or services during any year in that decade will be given by   ,   where t is time in years and P is the present cost.If the price of an oil change for your car is presently $25.95,estimate the price 10 years from now.Round your answer to two decimal places. where t is time in years and P is the present cost.If the price of an oil change for your car is presently $25.95,estimate the price 10 years from now.Round your answer to two decimal places.

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​Find​ ​Find​     ​ ​Find​     ​

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For For   ,calculate   to three decimal places. ​ ,calculate For   ,calculate   to three decimal places. ​ to three decimal places. ​

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​Use the given information to write an exponential equation for y.Does the function represent exponential growth or exponential decay? ​ ​Use the given information to write an exponential equation for y.Does the function represent exponential growth or exponential decay? ​   ,when  ,when ​Use the given information to write an exponential equation for y.Does the function represent exponential growth or exponential decay? ​   ,when

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​Sketch the graph of the function ​Sketch the graph of the function   ​

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​Simplify ​Simplify   ​

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

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​A survey of high school seniors from a certain school district who took the SAT has determined that the mean score on the mathematics portion was 500 with a standard deviation of 15.5.Assuming the data can be modeled by a normal probability density function,find a model for these data.

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​Find ​Find   if   ​ if ​Find   if   ​

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​The average time between incoming calls at a switchboard is 3 minutes.If a call has just come in,the probability that the next call will come within the next t minutes is ​The average time between incoming calls at a switchboard is 3 minutes.If a call has just come in,the probability that the next call will come within the next t minutes is   Find the probability that the next call will come within the next   minute.Round your answer to two decimal places. Find the probability that the next call will come within the next ​The average time between incoming calls at a switchboard is 3 minutes.If a call has just come in,the probability that the next call will come within the next t minutes is   Find the probability that the next call will come within the next   minute.Round your answer to two decimal places. minute.Round your answer to two decimal places.

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​Solve the exponential equation.Give the answer correct to 3 decimal places. ​ ​Solve the exponential equation.Give the answer correct to 3 decimal places. ​   ​

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​If ​If   ,find   ​ ,find ​If   ,find   ​

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​Find the equation of the tangent line to ​Find the equation of the tangent line to   at the point   ​ at the point ​Find the equation of the tangent line to   at the point   ​

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​Solve ​Solve   for t.Round your answer to four decimal places. ​ for t.Round your answer to four decimal places. ​

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​Use a calculator to evaluate the logarithm ​Use a calculator to evaluate the logarithm   Round your answer to three decimal places. Round your answer to three decimal places.

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

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Use the properties of exponents to simplify the expression Use the properties of exponents to simplify the expression   ​

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