Bismuth-210 has a half-life of 5 days. Find the amount of Bismuth-210 left from a
100-gram sample after 5 weeks?

0.78125g

Step-by-step explanation:

Since there are 35 days in 5 weeks, 7 half-lives of Bismuth-210 will take place. To solve for that, you can divide 100g by 2, 7 times or simply:

13.33%

say 50 oranges, then 100 apples

80 are red, 20 are yellow

total fruit = 150

20chances out of 150 for yellow

20/150 = 13.33%

-2

7 - 9 = -2

reversed:

-2 + 9 = 7