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3 years ago

-7.-8=-56 True False

Mathematics

2 answers:

LiRa [457]3 years ago

8 0

Answer:

False

Step-by-step explanation:

A negative multiplied by another negative will give you a positive. The answer to -7 x -8 would be positive 56.

iVinArrow [24]3 years ago

4 0

Answer:

true

Step-by-step explanation:

your welcome

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Richard and teo have combined age of 36 Richard is 9 years older than twice

Juliette [100K]

Answer:

27 years old

Step-by-step explanation:

So if they are 9 years old you can do 36 minus 9. You get 27. And it said the Ages combined, so if we combine/plus 27 and 9 then you get 36.

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3 years ago

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Answer:

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3 years ago

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Stels [109]

Answer:

x = 5

Step-by-step explanation:

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3 years ago

The 2000 census "long form" asked the total 1999 income of the householder, the person in whose name the dwelling unit was owned

shutvik [7]

Answer:

The 99% confidence interval for the 1999 mean incomes of Middletown householders is ($33,013.5, $33,892.5).

Step-by-step explanation:

Of the 40,000 persons, 2621 householders reported their income.

The sample size of the study is, n = 2621.

As the sample size is large, i.e. n > 30 use z-distribution to compute the confidence interval.

The confidence interval for mean is:

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

The mean of this sample is, $\bar x=\$33,453$

The standard deviation is, $s\approx\sigma=\$8,721$

The critical value of z for 99% confidence level is:

$z_{\alpha /2}=z_{0.01/2}=z_{0.005}=2.58$

The 99% confidence interval for the 1999 mean incomes of Middletown householders is:

$CI=\bar x\pm z_{\alpha /2}\frac{\sigma}{\sqrt{n}}\\=33453\pm2.58\times\frac{8721}{\sqrt{2621}}\\=33453\pm439.50\\=(33013.5, 33892.5)$

Thus, the 99% confidence interval for the 1999 mean incomes of Middletown householders is ($33,013.5, $33,892.5).

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3 years ago

Paul is solving an equation on the bottom of a page. His pen breaks, and ink spills on the corner of the page where the equation

svlad2 [7]

Answer: Option B

Step-by-step explanation:

If the solution is 6 then it means that x=6.

Let's call the missing number y

Substitute x=6 and y into the equation and solve for y:

$6(6+4)=6(6+7)-y\\6(10)=6(13)-y\\60=78-y\\y=78-60\\y=18$

The options does not show 18, but the option B shows 3x, then if x=6:

$3x=3*6=18$

The answer is the option B

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4 years ago