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3 years ago

Which complex number is represented by the graph

Mathematics

1 answer:

Dmitrij [34]3 years ago

4 0

Answer:

$3-4i$

Step-by-step explanation:

The x-axis represents $x$ and $x$ is 3. The y-axis represents $iy$ and $y$ is -4 so $iy$ is -4i.

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Find the discriminant and the number of real roots for the equation.<br><br> 4x^2+12x+9=0

netineya [11]

Answer:

Step-by-step explanation:

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3 years ago

Suppose you ride your bicycle to the library traveling at 0.50km/min. It takes you 25 minutes to get to the library. How far did

wel

12.5 km sorry if i am wrong

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3 years ago

I need need help on this

Crazy boy [7]

Answer:

points A, B and D are all in the same plane but not all are on the same line

Step-by-step explanation:

points A, C, D are all collinear which means they must also be coplanar

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3 years ago

The state education commission wants to estimate the fraction of tenth grade students that have reading skills at or below the e

marusya05 [52]

Answer:

The estimation for the proportion of tenth graders reading at or below the eighth grade level is given by:

$\hat p =\frac{955-812}{955}= 0.150$

$0.150 - 1.64 \sqrt{\frac{0.150(1-0.150)}{955}}=0.131$

$0.150 + 1.64 \sqrt{\frac{0.150(1-0.150)}{955}}=0.169$

And the 90% confidence interval would be given (0.131;0.169).

Step-by-step explanation:

We have the following info given:

$n= 955$ represent the sampel size slected

$x = 812$ number of students who read above the eighth grade level

The estimation for the proportion of tenth graders reading at or below the eighth grade level is given by:

$\hat p =\frac{955-812}{955}= 0.150$

The confidence interval for the proportion would be given by this formula

$\hat p \pm z_{\alpha/2} \sqrt{\frac{\hat p(1-\hat p)}{n}}$

For the 90% confidence interval the significance is $\alpha=1-0.9=0.1$ and $\alpha/2=0.05$ , with that value we can find the quantile required for the interval in the normal standard distribution and we got.

$z_{\alpha/2}=1.64$

And replacing into the confidence interval formula we got:

$0.150 - 1.64 \sqrt{\frac{0.150(1-0.150)}{955}}=0.131$

$0.150 + 1.64 \sqrt{\frac{0.150(1-0.150)}{955}}=0.169$

And the 90% confidence interval would be given (0.131;0.169).

8 0

3 years ago

A mixed number always consists of a _____ number plus a fraction.

Aleks [24]

Answer:

whole number and a fraction

8 0

3 years ago