It depends on your definition of “ancient.” Radiometric dating using Carbon-14 can reliably date back to about 50,000 years, uranium-lead or lead-lead dating can date back multiple millions, potassium-argon dating can reach 1.5 billion, and rubidium-strontium can reach 50 billion (nearly 4x the age of the universe). It depends on the context in which this question is being asked.
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Answer:
0.05L
Explanation:
if i understqnd this correctly the water line should increase with the mass of the marble
100-50=50ml
=0.05L
Answer:
Angle=70°
Explanation:
Given data
a=2i-5j+k
b=9i-k
To find
Angle Θ
Solution
As we know from dot product rule that

First we need to find a.b
As
i.i=j.j=k.k=1
i.j=i.k=j.k=0
So

Now for |a| and |b|

So the angle is given as
