5 years are called a quinquennium
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No, a decade is a period of 10 years and a lustrum is a period of 5 years.
Pentagon
The half-life of C14 is 5730 years so the given period is 5 half-lives. You should, therefore, expect approx 2-5 = 0.03125 of the original C14 to remain.
Well, honey, if 10 years is a decade, then 5 years is half a decade. It's as simple as cutting a cake in half - except with time. So, there you have it, 5 years is half a decade. Hope that clears things up for ya!
Invest at an amount of 200000 at a bank that offers an interest rate of 7,6%p.a Compounded annually for a period of 3 years