Answer:
D
Step-by-step explanation:
You take 130 divide by 2 to get 65 when its 1/3 full. Times 3 to 65 when its 3/3 full meaning full. 165 is your answer.
Answer:
The age of the spear head is of 1938 yers.
Step-by-step explanation:
The amount of carbon 14 after years is given by the following equation:

In which Q(0) is the initial amount and r is the decay rate.
The half life of carbon 14 is 5700 years.
This means that 
So








So

We have to find:
t for which Q(t) = 0.79Q(0). So








Rounding to the nearest year.
The age of the spear head is of 1938 yers.
Answer:
A
Step-by-step explanation:
-b=d
since c=0
b and d have the same absolute value
Answer:
C.)
Step-by-step explanation: