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a_sh-v [17]
3 years ago
12

A seventh grade student chooses a random sample of 50 out of 400 students. He finds that 7 students have traveled outside the Un

ited States. The students claim that over 50 of the 400 students have likely traveled outside the United States. Is the student correct? Explain.
Mathematics
1 answer:
aev [14]3 years ago
7 0

Answer:

Yes.

Step-by-step explanation:

Since he only sampled 50/400, 50 of 400 is 1/8.

7x8=56.

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Answer:

1. 6x^2 + 4x - 4y

2. x - 10y.

3. 6x^5

4.  36 a^6 b^8

5. x^2 - 81

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7. 12x^2 +3x - 42


Step-by-step explanation:

1. 3x^2+4x+3x^2-4y

Add the like terms, we get

6x^2 + 4x - 4y


2. (5x-2y)-(4x+8y)

Now distribute the negative sign, we get

5x - 2y -4x -8y

Simplify the like terms, we get

x - 10y.


3. 3x^3(2x)^2

Multiply the numbers and simplify the variables

6x^(3 +2)

6x^5

4. (-6a^3b^4)^2

Now bring the power 2 inside the parenthesis.

-6^2 a^6 b^8

= 36a^6b^8


5. (x+9) (x-9)

x^2 + 9x -9x - 81

x^2 - 81


6. (3x-7)^2

(3x - 7)(3x - 7)

9x^2 - 21x -21x + 49

9x^2 - 42x + 49


7. (3x+6) (4x-7)

12x^2 + 24x -21x - 42

12x^2 +3x - 42

Thank you.

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