Answer:
about 5.9%
Step-by-step explanation:
We assume that the original amount of Pb-210 present at death decays at the given rate. The fraction (f) remaining is multiplied by 1/2 every 22 years, so can be modeled by ...
f = (1/2)^(t/22) . . . . . where t is in years after death
Then, for t=90, the remaining fraction is ...
f = (1/2)^(90/22) ≈ 0.05868 ≈ 5.9%
Answer:

Step-by-step explanation:

♨Rage♨
Answer:
yes, no, yes, no
Step-by-step explanation:
Answer:
15. 122.49 16.13.17
Step-by-step explanation:
Use x as the variable for Kim's sister's age. kim being twice as old as her sister should be represented as 2x. their ages add up to 36 so put add the terms representing Kim and her sisters age and make it equal to 36.