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3 years ago

Rewrite in simplest terms: 4 x − 5 ( x + 3 )

Mathematics

1 answer:

rusak2 [61]3 years ago

4 0

Answer:

Step-by-step explanation:

4x - 5(x + 3) Remove the brackets. Watch the - sign and -5*3

4x - 5x - 15 Combine the xs

-x - 15

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Ming works as a quality assurance analyst at a bottling factory. She wants to use a one-sample z interval to estimate what propo

Nastasia [14]

Answer:

Sample size is $n=423$

Step-by-step explanation:

Given that,

Margin of error $=4$ %

Confidence level $=90$ %

Suppose, sample proportion $=0.5$

i.e. $\hat{P}=0.5$

We know that,

Margin of error $=2^*\sqrt{\frac{\hat{p}(1-\hat{p})}{n} }$

∴ $1.64\sqrt{\frac{0.5(0.5)}{n} } \leq 4\%$

$\Rightarrow 1.64\sqrt{\frac{0.25}{n} } \leq 0.04$

$\Rightarrow \frac{0.5}{\sqrt{n} } \leq \frac{0.04}{1.64}$

$\Rightarrow \frac{0.5}{\sqrt{n} } \leq 0.0243$

$\Rightarrow \sqrt{n}\geq \frac{0.5}{0.0243}$

$\Rightarrow \sqrt{n}\geq 20.57$

squaring on both side,

∴ $n=423.1249$

Hence, the sample size is,

$n=423$

Hence, the correct option is $(b).$

7 0

3 years ago

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nalin [4]

The answer to your question is 3

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3 years ago

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HELP FIRST GET BRAINLLEST Which of the statements below are true? Select all that apply. A) Joan's friends did better on the tes

oksano4ka [1.4K]

Answer:

B and C

Step-by-step explanation:

To figure out the average of all of the scores, you add all of the numbers together and then divide by how many numbers there are. The average shows about how well they did. Anne's friends average was 90 and was higher than Joan's friends average which was 75. Then the lowest score was definitely 78. So the answer would be B and C.

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3 years ago

Divide £500 in a ratio of 3:7 ? pleaseee help

Inga [223]

3+7 = 10
You do 500/10 which is 50 to find out 1
1 = 50
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The ratio is 150 : 350

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3 years ago

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djyliett [7]

Answer:

170

Step-by-step explanation:

multiply 12×15=170

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3 years ago