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Section 7.8 Logs Exponential decay/growth

Authored by Joan McManus

Mathematics

Professional Development

CCSS covered

Used 2+ times

Section 7.8 Logs Exponential decay/growth
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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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Answer explanation

15, 809 years

Tags

CCSS.HSF.LE.A.4

3.

OPEN ENDED QUESTION

3 mins • 1 pt

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Answer explanation

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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Tags

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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