Answer:
The miner would have 3 1/2 of radioactive material in the sample at the beginning of the 7th day.
Step-by-step explanation:
hope this helped!
13
X is most likely used to symbolize a number under twenty but over 10 - but you don't have the question posted
80
-4,-1,2,5,8,11,14,17,20,23,26,29,32,35,38,41,44,47,50,53,56,59,62,65,68,71,74,77,80.
79 = 13+15+24+ missing side. 79 = 52 + missing side
