algebra
posted by gary .
An artifact was found and tested for its carbon14 content. If 75% of the original carbon14 was still present, what is its probable age (to the nearest 100 years)? (Carbon14 has a halflife of 5,730 years.)
thank you

algebra 
Reiny
amount = initial (.5)^(t/5730)
.75 = 1 (.5)^(t/5730)
log .75 = (t/5730) log .5
t/5730 = log .75/log .5 = .415...
t = 2378.16
age is about 2400 years to the nearest century
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