The bones of a saber-toothed tiger are found to have an activity per gram of carbon that is 12.9 % of what would be found in a similar live animal. how old are these bones?

The bones are 16925 years old

Explanation:

We have to use the radioactive decay law and know that the half life of carbon-14 is . From this information we can know the decay rate of the carbon 14,

Now to know the age of the bones we must directly use the radioactive decay law:

Where the rightmost part of the equation comes from the statement that the activity found is just 12.9% of the activity that would be found in a similar live animal. This means that the number of carbon-14 atoms is just 12.9% of what it was at the moment the saber-toothed tiger died.

Solving for t we have:

the device is called “ rocket engine”

find the surface area of the sphere to the nearest square unit. use a calculator.

a. 254 in.2

b. 64 in.2

c. 127 in.2

d. 1,018 in.2