This is a fairly easy half-life problem
Each half-life reduces the radioactive material by one half.
So after 72 hours the radioactive material would have undergone 6 half-lives.
2^6 = 64.
So, there will be one sixty-fourth of the material left.
520 / 64 = 8.125 grams will remain.
radioactive decay is an exponential decay function.
Source:
http://www.1728.org/halflife.htm
4 +2 +4 = 10 blocks total
2 are blue so you have a 2/10 which reduces to 1/5 probability of picking blue
5/1 x 7/10 = 35/10 = 3 5/10 = 3 1/2
3 and 4
Answer:
<u>11 boys 8 girls</u>
Step-by-step explanation:
There are 19 total students.
There are 3 more boys than girls
girls + 3 = boys ( because there are three more boys)
boys + girls = 19
You can substitute g +3 for b so:
2 girls +3 = 19
19 - 3 = 16
16/2 = girls
8 = girls
Once you find g just subtract the amount of girls from 19 to get the amount of boys.
19 kids - 8 girls = 11 boys