SOLUTION: The number of frogs in a lake decrease by x% each year. Given that the number of frogs halves in 8 years, work out the value of x. Give your answer correct to 1 decimal place.

Question 1076999: The number of frogs in a lake decrease by x% each year.
Given that the number of frogs halves in 8 years, work out the value of x.
Give your answer correct to 1 decimal place.
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
As a decimal, x% =
Let = the number of frog to begin with
= the number of frogs after yrs
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Divide both sides by

Take the eigthth root of both sides

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check:

close enough
check the math

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