Answer:
y=-72
Step-by-step explanation:
3(-2) = -6, y=12 times -6, y= -72
Answer: 
Step-by-step explanation:
Given
Initial mass of radium is 
It decays by half every 6 years i.e. 
For radioactive decay, sample at any time is given by

Insert the values

Thus, option (b) is correct.
So it's multiple choice?
whichever looks most like this is the answer:
30mn+6n-36m
Answer:
1.4
Step-by-step explanation:
Divide 2.8 by 2 because of 2 minutes to make it 1 minute.