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nataly862011 [7]
3 years ago
7

A _____ group is used to control for the subjects' expectations as they participate in an experiment.

Social Studies
1 answer:
Murrr4er [49]3 years ago
5 0
I believe the answer would a control group.
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You have two parents, four grandparents, eight great-grandparents, and so forth. (a) If all your ancestors were distinct, what w
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Answer:

From the first generation = 2 ancestors.

From the second generation = 4 ancestors or (2)^2 ancestors.

From the third generation = 8 ancestors or (2)^3 ancestors.

We can infer from the given data, each consecutive generation possesses twice the number of members.

The sum will be:

2 + 4 + 8 + 16 + ... + (2)^39

To evaluate the amount of ancestors, let's employ the formula for the summation of a geometric sequence.

(Geometric sequence shows the sequence of numbers that varies by a specific factor. This factor is specifically known as a ratio).

Formula for Geometric sequence:

S = (a1) × 1 - (r)^n

--------------------------

1 - r

Take:

S -> sum

a1 -> first member of a sequence

r -> ratio

n -> number of elements

In this question, our:

a1 = 2; r = 2; and n = 39

S = (2) × 1 - (2)^39

-------------------------

1 - 2

S = 1,099,511,627,777

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4 years ago
Which of the following phrases BEST defines the term export?
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Answer:

B because the first one is called tariffs.

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3 years ago
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How might the use of fire have affected human migration?
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i believe it is B I am also stuck on this question but B sounds the best.



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True or False. Because of restrictive laws emphasizing cultural separation, nineteenth-century Russian Jews were unable to pursu
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False

Explanation:

Though, historically Jews have face some discrimination in Russia regarding their religious believe, Russian Jews were not restricted to pursue the careers they choose. there were Jews who succeeded in business and politics.

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John Quincy Adams thought that the United States would grow to reach from the Atlantic Ocean to the Pacific Ocean. What happened
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