Answer:

Step-by-step explanation:
hope this helps.
Answer:
0.06
Step-by-step explanation:
6/100 is 0.06
His score was 40 each question was worth 5 points
Given that the half life of 3H is 12.3 years.
The amount of substance left of a radioactive substance with half life of

after t years is given by

Therefore, the number of years it will take for 18% of the original tritinum to remain is given by

Therefore, the number of <span>years that the time could be read at night is 30.4 years.</span>
Answer:
Graph is attached :)
Step-by-step explanation:
Hope that helps!