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3 years ago

What is the Answer.

Mathematics

1 answer:

jok3333 [9.3K]3 years ago

3 0

Answer:

Step-by-step explanation:

4x+100+3x+79=32

7x+179=32

7x=-147

x=-21

Now, plug in the numbers.

3(-21)+79=-61+79

=18

Hope I helped! Please mark Brainliest!!!

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Marizza181 [45]

XD no sé que decir E=mc2 lo siento.

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3 years ago

Solve 7x - 8 = 3x + 40

Contact [7]

Answer:

$7x-8=3x+40\\7x-3x=40+8\\4x=48\\x=12$

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2 years ago

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Divide -6/7 by 2/-3 please give answer very fast its urgent

defon

Answer:

0.14285714285

Step-by-step explanation:

divide on calculator and make sure to have negative sign before three, remember you are dividing fractions

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3 years ago

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An automobile company wants to determine the average amount of time it takes a machine to assemble a car. A sample of 40 times y

aksik [14]

Answer:

A 98% confidence interval for the mean assembly time is [21.34, 26.49] .

Step-by-step explanation:

We are given that a sample of 40 times yielded an average time of 23.92 minutes, with a sample standard deviation of 6.72 minutes.

Firstly, the pivotal quantity for finding the confidence interval for the population mean is given by;

P.Q. = $\frac{\bar X-\mu}{\frac{s}{\sqrt{n} } }$ ~ $t_n_-_1$

where, $\bar X$ = sample average time = 23.92 minutes

s = sample standard deviation = 6.72 minutes

n = sample of times = 40

$\mu$ = population mean assembly time

Here for constructing a 98% confidence interval we have used a One-sample t-test statistics because we don't know about population standard deviation.

So, a 98% confidence interval for the population mean, $\mu$ is;

P(-2.426 < $t_3_9$ < 2.426) = 0.98 {As the critical value of z at 1% level

of significance are -2.426 & 2.426}

P(-2.426 < $\frac{\bar X-\mu}{\frac{s}{\sqrt{n} } }$ < 2.426) = 0.98

P( $-2.426 \times {\frac{s}{\sqrt{n} } }$ < ${\bar X-\mu}$ < $2.426 \times {\frac{s}{\sqrt{n} } }$ ) = 0.98

P( $\bar X-2.426 \times {\frac{s}{\sqrt{n} } }$ < $\mu$ < $\bar X+2.426 \times {\frac{s}{\sqrt{n} } }$ ) = 0.98

98% confidence interval for $\mu$ = [ $\bar X-2.426 \times {\frac{s}{\sqrt{n} } }$ , $\bar X+2.426 \times {\frac{s}{\sqrt{n} } }$ ]

= [ $23.92-2.426 \times {\frac{6.72}{\sqrt{40} } }$ , $23.92+2.426 \times {\frac{6.72}{\sqrt{40} } }$ ]

= [21.34, 26.49]

Therefore, a 98% confidence interval for the mean assembly time is [21.34, 26.49] .

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2 years ago

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Mumz [18]

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2 years ago

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What is the Answer.