Question

Assuming a parent isotope with a half-life equal to 4.5 billion years, what percentage

of the original parent remians after 6.75 billion years have passed?

Answer 1

35.4 % left

Step-by-step explanation:

6.75 / 4.5 = 1.5 half lives

1/2 ^(1.5) = .354 or 35 .4 %