Mathematics, 22.06.2021 07:50, teagan56
Element X is a radioactive isotope such that every 69 years, its mass decreases by half. Given that the initial mass of a sample of Element X is 20 grams, how much of the element would remain after 30 years, to the nearest whole number?
Answers: 3
every 69 years.
, is equal to the initial mass multiplied by 
, where 
is the number of years that have passed from the initial mass. The reason why the exponent is 
is because we only want to half the mass every 69 years, so 
and 
.
, we get:
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Element X is a radioactive isotope such that every 69 years, its mass decreases by half. Given that...
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