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Zigmanuir [339]

3 years ago

7

Simplify

ign="absmiddle" class="latex-formula">

1 answer:

kakasveta [241]3 years ago

7 0

Answer:

Step-by-step explanation:

$\displaystyle \Large \boldsymbol{} x^2+10x+9=0 \\\\ x^2+\underbrace{x+9x}_{10x}+9=0 \\\\x^2+x+\underline9x+\underline9=0 \\\\x(x+1)+9(x+1)=(x+9)(x+1)$

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One half of your CDs are scratched. One fifth will not play properly. You have 40 CDs. How many will not work play properly

kvasek [131]

1/2 of 40= 20

40/5=8

20+8=28

28 of your CDs will not work properly.

I hope this helps!

6 0

3 years ago

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Which statement is true?

alexgriva [62]

The Correct answer is C. -14 + (-10) = -24 and 2 + (-28) = -26. When negative numbers are in play, the lower negative number is higher in value. So when solved -24 > -26

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3 years ago

Kevin from Pullman was offered a deal to write story problems for ST2 publishing Company. For every 5 he wrote he was paid $12.0

kari74 [83]

Answer:

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Step-by-step explanation:

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2 years ago

According to Scarborough Research, more than 85% of working adults commute by car. Of all U.S. cities, Washington, D.C., and New

tamaranim1 [39]

Answer:

The 99% confidence interval for the mean commute time of all commuters in Washington D.C. area is (22.35, 33.59).

Step-by-step explanation:

The (1 - <em>α</em>) % confidence interval for population mean (<em>μ</em>) is:

$CI=\bar x\pm z_{\alpha /2}\frac{\sigma}{\sqrt{n}}$

Here the population standard deviation (σ) is not provided. So the confidence interval would be computed using the <em>t</em>-distribution.

The (1 - <em>α</em>) % confidence interval for population mean (<em>μ</em>) using the <em>t</em>-distribution is:

$CI=\bar x\pm t_{\alpha /2,(n-1)}\frac{s}{\sqrt{n}}$

Given:

$\bar x=27.97\\s=10.04\\n=25\\t_{\alpha /2, (n-1)}=t_{0.01/2, (25-1)}=t_{0.005, 24}=2.797$

*Use the <em>t</em>-table for the critical value.

Compute the 99% confidence interval as follows:

$CI=27.97\pm 2.797\times\frac{10.04}{\sqrt{25}}\\=27.97\pm5.616\\=(22.354, 33.586)\\\approx(22.35, 33.59)$

Thus, the 99% confidence interval for the mean commute time of all commuters in Washington D.C. area is (22.35, 33.59).

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3 years ago

Which is larger? 7/10 or .67?

arsen [322]

Answer:

7/10

Step-by-step explanation:

7/10 can be written in decimal form as 0.7.

Clearly, we know 0.7 > 0.67.

3 0

2 years ago

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