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MariettaO [177]
3 years ago
13

-4(-3x - 7) whats the answer

Mathematics
2 answers:
kiruha [24]3 years ago
8 0
12x+28 is the simplified expression
Reika [66]3 years ago
4 0

Answer:

12x + 28

Step-by-step explanation:

-4(-3x - 7)   Distribute the -4. When you multiply two negatives you get a positive.

12x + 28

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a study studied the birth weights of 1,999 babies born in the United States. The mean weight was 3234 grams with a standard devi
Aleks [24]

Answer:

1899

Step-by-step explanation:

The Empirical Rule states that, for a normally distributed random variable:

68% of the measures are within 1 standard deviation of the mean.

95% of the measures are within 2 standard deviation of the mean.

99.7% of the measures are within 3 standard deviations of the mean.

In this problem, we have that:

Mean = 3234

Standard deviation = 871

Percentage of newborns who weighed between 1492 grams and 4976 grams:

1492 = 3234 - 2*871

So 1492 is two standard deviations below the mean.

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So 4976 is two standard deviations above the mean.

By the Empirical Rule, 95% of newborns weighed between 1492 grams and 4976 grams.

Out of 1999:

0.95*1999 = 1899

So the answer is 1899

8 0
3 years ago
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Answer:

C

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3 years ago
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C. Determine the principal square root of both sides of the equation.

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I need help with this math problem.
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