The spear is 4620 years old.
N=N0e^-kt
N0 = initial amount of C-14 (at time t = 0)
N = amount of C-14 at time t
t = time, in years
k = 0.0001
N/N0 = e^-kt
we know N/N0 is 0.63
so we have:
0.63 = e^-kt
we can take the ln of both sides, leaving us with:
ln0.63 = -kt
t = ln0.63 / -(0.0001)
t = 4620 years
hope this helps with your thing!
-keynerd23
In the domain system, the domain Eukarya includes organisms from more than one kingdom.
<u>Answer:</u>
<em>White fat is found in </em><u><em>the belly</em></u><em> and brown fat is found in </em><u><em>the upper back, front and back of neck.
</em></u>
<u>Explanation:</u>
White fat cells perform the function of energy storage and they also help in maintaining the body temperature by acting as a thermal insulator. Lesser number of blood vessels and mitochondria gives the characteristic light yellow or white colour to white fat.
Brown fat consists of large number of mitochondria containing iron and blood vessels which gives it a characteristic brown colour. Brown fat has the purpose of fat burning. Quantity of brown fat decreases as humans approach adulthood.