13. Calculate the following and express the answer to the correct number of significant
figures:
(4.0 x 1024 x (8.1 x 102)
a) 3 x 101
b) 3.2 x 101
c) 3.0 x 101
d) 3.24 x 101
e) 3.3 x 101

What do you need with it’s not a question your just stating what it says

Radon-222 or rn-222 has a half-life of 3.82 days. to determine the fraction of an original sample of rn-222 that remains unchanged after 7.646 days, we calculate the amount of rn-222 remaining after 7.646 days and divide it with the original amount. using 1 gram as a basis and using half-life calculation methods, we can determine that  0.249 or 0.25  grams of rn-222 will remain, and thus the fraction remaining is 0.25 or 1/4.

Where is the illustration?