Answer:
$2.93
Step-by-step explanation:
67.50/23=2.9347826087 sorry had to use 20 characters in the explanation
Answer:
First option
Step-by-step explanation:

Answer:
2.14
Step-by-step explanation:
Basically its like regular subtraction
4.6
-
2.46
________
2.14
Answer:
and 
Step-by-step explanation:
The equation of the isotope decay is:

14-Carbon has a half-life of 5568 years, the time constant of the isotope is:


The decay time is:
(There is no a year 0 in chronology).

Lastly, the relative amount is estimated by direct substitution:




