D: (-infinity, 0) U (0, infinity) because you cant have a zero in the bottom of the fraction
Answer:
does anyone know the answer????????
Step-by-step explanation:
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Answer:
The answer is 900 ×6= 5,400 u can use a calculator
The amount of substance left of a radioactive element of half life,

after a time, t, is given by:

Given that <span>potassium-40 has a half life of approximately 1.25 billion
years.
The number of years it will take for 0.1% of potassium-40 to remain is obtained as follows:

Therefore, </span><span>the maximum age of a fossil that we could date using 40k is
12.5 billion years.</span>