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2 years ago

Which of the following social groups exists in all known cultures?

Geography

2 answers:

Monica [59]2 years ago

8 0

Answer:

D. Families

Explanation:

All different cultures have some sort of Family Unity

stealth61 [152]2 years ago

7 0

Answer:

The correct answer is D, families.

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Which of the following statements about the Canadian Charter of Rights and Freedoms is true?

kenny6666 [7]

C is correct, the charter is an unwritten but binding document

7 0

3 years ago

WXYZ is an isosceles trapezoid. WY=8x-3 and ZX=19. Find the value of x.

fenix001 [56]

Given:

WXYZ is an isosceles trapezoid. WY=8x-3 and ZX=19.

To find:

The value of x.

Solution:

We know that the diagonals of an isosceles trapezoid are equal. So,

$WY=ZX$

$8x-3=19$

Add 3 on both sides.

$8x-3+3=19+3$

$8x=22$

Divide both sides by 8.

$x=\dfrac{22}{8}$

$x=2.75$

Therefore, the correct option is B.

4 0

2 years ago

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

2 years ago

Geologic maps are most recognized by their _____ which represent different _____.

Sever21 [200]

Geologic maps are most recognized by their contour lines which represent different elevations. The correct option among all the options that are given in the question is the last or the fourth option. Geologic maps are important for all geologists around the world. I hope the answer comes to your help.

8 0

3 years ago

Read 2 more answers

Primary succession occurs when you have _____.

vova2212 [387]

Primary succession occurs when new land is formed or bare rock is exposed

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3 years ago