Question

A rock sample has 25% of its original radioactive element and the half-life of the

element is 1 million years. How old is the sample?
A.)2 Million Years
B.)0 1 Million Years
C.)500.000
D.)50,000

Answer 1

c 500000

Step-by-step explanation:

the half was 1000000 so it's 2000000 and 25% of that is 500000