Math
posted by Tarah .
A wooden artifact from an ancient tomb contains 70% of the carbon14 that is present in living trees. How long ago was the artifact made? (The halflife of carbon14 is 5730 years. Round your answer to the nearest whole number.)
And....
An infectious strain of bacteria increases in number at a relative growth rate of 200% per hour. When a certain critical number of bacteria are present in the bloodstream, a person becomes ill. If a single bacterium infects a person, the critical level is reached in 24 hours. How long will it take for the critical level to be reached if the same person is infected with 9 bacteria? (Round your answer to two decimal places.)
Respond to this Question
Similar Questions

physics
A wooden artifact is found in an ancient tomb. Its carbon14 activity is measured to be 60.0% of that in a fresh sample of wood from the same region. Assuming the same amount of carbon14 was initially present in the wood from which … 
math
An artifact was found and tested for its carbon14 content. If 79% of the original carbon14 was still present, what is its probable age (to the nearest 100 years)? 
Chemistry
An artifact has a carbon14 to carbon12 ratio that is onefourth the carbon14 to carbon12 ratio of a similar modern object. How old is the artifact? 
Algebra
An artifact was found and tested for its carbon14 content. If 74% of the orginal carbon14 was still present, what is its probable age (to the nearest 100 years)? 
College Algebra
This exercise uses the radioactive decay model. A wooden artifact from an ancient tomb contains 80% of the carbon14 that is present in living trees. How long ago was the artifact made? 
Algebra
A wooden artifact from an ancient tomb contains 45 percent of the carbon14 that is present in living trees. How long ago, to the nearest year, was the artifact made 
College Algebra
A wooden artifact from an ancient tomb contains 45% of the carbon14 that is present in living trees. How long ago, to the nearest year, was the artifact made 
math
A wooden artifact from an ancient tomb contains 70% of the carbon14 that is present in living trees. How long ago was the artifact made? 
calculus
A wooden artifact recovered from a tomb contains 29% of the carbon14 that is present in living trees. The half life of carbon14 is 5730 years. How long ago was the artifact made? 
MATH 123
A wooden artifact from an ancient tomb contains 55% of the carbon14 that is present in living trees. How long ago was the artifact made?