Answer:
A) .9423
Step-by-step explanation:
The chance of getting at most 13 heads is 0.9423
Answer: There will be 22.694 grams of initial mass remains after 50 years.
Step-by-step explanation:
Since we have given that

We need to find the quantity of initial mass remains after 50 years.
So, t = 50 years,
We get that

Hence, there will be 22.694 grams of initial mass remains after 50 years.
I don't know how to set up a diagram for this, but I could write an expression. 20*4= x
sorry, but I hope this helps. I not even sure my expression is correct.
189.
3*1=34 --> split this into two parts. 3*1 is 3 and 3+1 is 4 so put them together and you get 34.