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3 years ago

Many people from southern Italy who have moved to Naples in search of jobs have _____.

Geography

2 answers:

Molodets [167]3 years ago

7 0

Your answer is D.<span> found work in factories and stores

I am sure about this, hope I helped :)
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valkas [14]3 years ago

6 0

Your answer would be 'found work in factories and stores' because they wanted to find economic opportunity x

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Calculate the amount, in grams, of an original 300-gram sample of radioactive isotope Potassium-40 remaining after

Aleksandr [31]

Answer:

The current amount of the Potassium-40 sample is approximately 37.521 grams.

Explanation:

The amount of the sample of the radioactive isotope decays exponentially in time, the amount of mass of the sample as a function of time ( $m (t)$ ), in grams, is described below:

$m(t) = m_{o}\cdot e^{-\frac{t}{\tau} }$ (1)

Where:

$m_{o}$ - Initial mass, in grams.

$t$ - Time, in years.

$\tau$ - Time constant, in years.

The time constant can be found from half life ( $t_{1/2}$ ), in years, described in statement:

$\tau = \frac{t_{1/2}}{\ln 2}$ (2)

If we know that $m_{o} = 300\,g$ , $t = 3.9\times 10^{9}\,yr$ and $t_{1/2} = 1.3\times 10^{9}\,yr$ , then the current amount of the sample is:

$\tau = \frac{1.3\times 10^{9}\,yr}{\ln 2}$

$\tau \approx 1.876\times 10^{9}\,yr$

$m = (300\,g)\cdot e^{-\frac{3.9\times 10^{9}\,yr}{1.876\times 10^{9}\,yr} }$

$m\approx 37.521\,g$

The current amount of the Potassium-40 sample is approximately 37.521 grams.

4 0

3 years ago

Match each term to its description.

Varvara68 [4.7K]

Answer:

crust- the earth's outmost layer

inner core- the metallic layer at the earth's center

lower mantle- hottest part of the mantle

asthenosphere- the semi solid layer between the top layer and the upper mantle

upper mantle- The layer between the asthenosphere and lower mantle

top layer- The firm layer between the crust and the asthenosphere

outer core- The layer surrounding the inner core

Explanation:

4 0

3 years ago

Point A is to the left of Point B on a horizontal number line.

Tatiana [17]

Answer:

Point A could be any number that is lower than point B.

Explanation:

Since A is to the left on a number line it is lower then the number to the right (point B)

Some examples of numbers are A=2 and B=6

5 0

2 years ago

Read 2 more answers

If you see a puddle on the ground, do you walk around it or over it?

Nataly [62]

Explanation:

over it thats the correct answee

6 0

2 years ago

Murljashka [212]

B is correct because the others are wrong, c is wrong because the reason they have varying states of matter is because pressure and a is wrong because mantle

7 0

2 years ago

Read 2 more answers