Section 7.8 Logs Exponential decay/growth
Authored by Joan McManus
Mathematics
Professional Development
CCSS covered
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5 questions
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1.
OPEN ENDED QUESTION
3 mins • 1 pt
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Answer explanation
Find "t" the half life by letting f(x) = 0.5 a , and solving for "t"
t= 1600yrs
2.
OPEN ENDED QUESTION
3 mins • 1 pt
Paint from the the Lascaux caves of France contains 15% of the normal amount of carbon-14. Estimate the age of the paintings. (round to the nearest hundred years)
(Hint...k=-0.00012 for Carbon-14)
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15, 809 years
Tags
CCSS.HSF.LE.A.4
3.
OPEN ENDED QUESTION
3 mins • 1 pt
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54.93 yrs
4.
OPEN ENDED QUESTION
3 mins • 1 pt
How long, to the nearest year, will it take money in an account that accrues interest at a rate of 3% to double ?
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CCSS.HSF.LE.A.4
5.
OPEN ENDED QUESTION
3 mins • 1 pt
What is the annual interest rate that will produce $4700 if $3500 is left at interest compounded annually for 10 years?
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