Tutors Answer Your Questions about Exponential-and-logarithmic-functions (FREE)
Question 319888: The amt of a pollutant, measured in parts per million, in pine lake can be by A(t)=14e-0.16t where t is the number of years since a program clean up. How long will it take for the pollutant in pine lake to reach 7 parts per million.
ANSWER: 12.52 YRS OR 4.33 YRS
Click here to see answer by josmiceli(19441)   |
Question 319915: The population of starke county is 72,000 and is growing at a rate of 4.8% per decade. Which one is an expression for population of starke county after n decades? I think the correct answer is (72,000(1.04800)n. please help
A) 72,000(1.48)n
B) 72,000(1.048)n
Click here to see answer by braithiar(3) |
Question 321160: given that log 8=0.9031 and log 9=0.9542 and obviously log 10=1, which logarithm cannot be found without the use of a calculator?
a. log 17 b. log (5/4) c. log 15 d. log 600 e. log 0.4
and also if you could show the work as how you got the answer. thank you so much :)
Click here to see answer by stanbon(75887) |
Question 321314: In 1964, paleontologists discovered the bones of a new species of dinosaur. The age of the dinosaur was estimated using potassium-40 dating of rocks surrounding the bones. Analysis of these rocks indicated that 82.8% of the original amount of the potassium-40 was still present. The decay model for potassium-40 is A=A(subzero)e^(-0.52912t), where t is in billions of years. Let A=0.828A(subzero) in this decay model and estimate the age of the bones of the dinosaur. The bones are _ billion years old. Round to four decimal places as needed.
Click here to see answer by stanbon(75887) |
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