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GalinKa [24]
3 years ago
11

1. 4x-3(2x+6)=-38and2. 27=-3x-6(-2x-21)Solve for X​

Mathematics
1 answer:
Nesterboy [21]3 years ago
8 0

Answer:

1. x=10 2. x=-11

Step-by-step explanation:

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An IQ test is designed so that the mean is 100 and the standard deviation is 1414 for the population of normal adults. Find the
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Answer:

37

Step-by-step explanation:

The first thing is to calculate critical z factor

the alpha and the critical z score for a confidence level of 90% is calculated as follows:

two sided alpha = (100% - 90%) / 200 = 0.05

critical z factor for two sided alpha of .05 is calculated as follows:

critical z factor = z factor for (1 - .05) = z factor for (.95) which through the attached graph becomes:

critical z factor = 2.58

Now we have the following formula:

ME = z * (sd / sqrt (N) ^ (1/2))

where ME is the margin of error and is equal to 6, sd is the standard deviation which is 14 and the value of z is 2.58

N the sample size and we want to know it, replacing:

6 = 2.58 * (14 / (N) ^ (1/2))

solving for N we have:

N = (2.58 * 14/6) ^ 2

N = 36.24

Which means that the sample size was 37.

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3 years ago
Find the area and perimeter of the algebra titles don't forget your units
Rufina [12.5K]
The perimeter of the large square is 24 and the area is 36 units
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Over the summer, Janice spent 120 hours reading. She
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Answer:

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Step-by-step explanation:

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Does the table shows a proportional relationship
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