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kondor19780726 [428]
2 years ago
11

Simplify (4x − 6) + (3x + 6). (2 points) a 7x b 7x − 12 c x d 7x + 12

Mathematics
2 answers:
aleksley [76]2 years ago
8 0

4x-6+3x+6=

7x

THE ANSWER IS "A"

ludmilkaskok [199]2 years ago
3 0

Answer:

A 7x

Step-by-step explanation:

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

4x - 6 + 3x + 6

7x

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Using traditional methods, it takes 95 hours to receive a basic flying license. A new license training method using Computer Aid
Snowcat [4.5K]

Answer:

There is not sufficient evidence to support the claim that the technique performs differently than the traditional method.

Step-by-step explanation:

The null hypothesis is:

H_{0} = 95

The alternate hypotesis is:

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The test statistic is:

z = \frac{X - \mu}{\frac{\sigma}{\sqrt{n}}}

In which X is the sample mean, \mu is the value tested at the null hypothesis, \sigma is the standard deviation and n is the size of the sample.

A researcher used the technique with 260 students and observed that they had a mean of 94 hours. Assume the standard deviation is known to be 6.

This means, respectively, that n = 260, X = 94, \sigma = 6

The test-statistic is:

z = \frac{X - \mu}{\frac{\sigma}{\sqrt{n}}}

z = \frac{94 - 95}{\frac{6}{\sqrt{260}}}

z = -2.69

The pvalue is:

2(P(Z < -2.69))

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0.0072 < 0.01, which means that the null hypothesis is accepted, that is, there is not sufficient evidence to support the claim that the technique performs differently than the traditional method.

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