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Rufina [12.5K]
3 years ago
9

To understand how democracy developed in ancient Greece, you must examine the polis, which was the Greek word for a.

Geography
1 answer:
AVprozaik [17]3 years ago
7 0
Polis is Greek for City or state
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Need help asap!
slava [35]

More than 75 percent

Explanation:

Let us carefully analyze this problem:

The half life of the rubidium isotope = 50 billion years

   The half-life of a radioactive isotope is the time it takes for it to decay to half of its original amount.

  Every 50years, we know that a rubidium isotope would split into half.

Initially when the isotope was formed, we would only have the parent atoms there. There wont be any daughter;

  ratio of parent to daughter = 100 : 0

When the isotope decays to half; we would have equal number of parent and daughter:

  ratio of parent to daughter at half life = 50 : 50

The age of the earth is about 4.6billion years;

this is;

          \frac{4.6}{50} x 100 = 9.2% of the half-life of the rubidium isotope.

At this time, we should know that only 9.2 percent of the daughter would have been formed.

The remaining parent would be 100 - 9.2 = 90.8% would still be left undecayed.

The ratio of parent to daughter  = 90.8 : 9.2

This is more than 75% of the parent

learn more

Radioactive decay brainly.com/question/10125168

#learnwithBrainly

4 0
3 years ago
Which of the following is a correct description of the Earth’s physical structure?
mars1129 [50]
It's a sphere *drops the mic*
4 0
2 years ago
Crustal plate movement occurs because the Earth's mantle flows as a result of uneven heating inside the mantle. Convection cells
Tresset [83]
The energy is generated by the semi-molten core of the earth which drives the convection currents in the mantle and which causes the plates to move in plate tectonics. James Hutton was the first geologist to intepret that the plutonic rocks on surface like granite were once molten.
8 0
3 years ago
Read 2 more answers
Maraming tao ang mayroong talento at kakayahan na gawin ang isang bagay na
notsponge [240]

Answer:

it's very easy and simple answer u can't do it

4 0
3 years ago
How much does a elephant weigh
Ksivusya [100]
At least three to a depend on which elephant
8 0
3 years ago
Read 2 more answers
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