Answer:
5.
Step-by-step explanation:
Answer:

Step-by-step explanation:
Use the formula for the volume of a cylinder
so then you plug in the values to get 
Step-by-step explanation:
it should be letter A on edge2020
The half-life is 29 years.
116 : 29 = 4
So we will have 4 periods of half-life:
( 1/2 )^4 = 1/16
150 g * 1/16 = 9.375 g
Answer:
9.375 g of strontium -90 will remain after 116 years.