Solve this quadratic equation using the quadratic formula x^2 + 8x

NEED ANSWERS ASAP THREE POINTERS

Nady [450]

You’re welcome stranger

8 0

3 years ago

Find the 20th term of an arithmetic sequence with a first term of 3 and a common difference of 5

musickatia [10]

So just keep subtracting 5 from three or do 5 times 20 - 3. that equals - 97

4 0

3 years ago

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An Austrian study was completed to determine if untrained sea lions and sea lionesses could follow various experimenter-given cu

Sholpan [36]

Using the z-distribution, it is found that since the test statistic is greater than the critical value for the right-tailed test, this result shows that Zwerg can correctly follow this type of direction by an experimenter more than 50% of the time.

<h3>What are the hypothesis?</h3>

At the null hypothesis, it is tested if Zwerg cannot correctly follow this type of direction by an experimenter more than 50% of the time, that is:

$H_0: p \leq 0.5$

At the alternative hypothesis, it is tested if Zwerg can correctly follow this type of direction by an experimenter more than 50% of the time, that is:

$H_1: p > 0.5$

<h3>Test statistic</h3>

The <em>test statistic</em> is given by:

$z = \frac{\overline{p} - p}{\sqrt{\frac{p(1-p)}{n}}}$

In which:

$\overline{p}$ is the sample proportion.

p is the proportion tested at the null hypothesis.

n is the sample size.

For this problem, the parameters are:

$n = 48, \overline{p} = \frac{37}{48} = 0.7708, p = 0.5$

The value of the <em>test statistic</em> is:

$z = \frac{\overline{p} - p}{\sqrt{\frac{p(1-p)}{n}}}$

$z = \frac{0.7708 - 0.5}{\sqrt{\frac{0.5(0.5)}{48}}}$

$z = 3.75$

Considering a <u>right-tailed test</u>, as we are testing if the proportion is greater than a value, with a <u>significance level of 0.05</u>, the critical value for the z-distribution is $z^{\ast} = 1.645$ .

Since the test statistic is greater than the critical value for the right-tailed test, this result shows that Zwerg can correctly follow this type of direction by an experimenter more than 50% of the time.

To learn more about the z-distribution, you can take a look at brainly.com/question/16313918

3 0

3 years ago

Find the area of circle with diameter of 52 cm. Use ≈3.14. <br> The area of circle is approximately?

Likurg_2 [28]

Answer:

169.56

Step-by-step explanation:

4 0

3 years ago

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E im so confused-<br> ( Please explain your answer! )

Drupady [299]

Answer:

B. 180° about the origin

Step-by-step explanation:

You are given a figure and its image, and asked to determine the angle of rotation. All of the answer choices indicate the center of rotation is the origin.

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You have two clues that the rotation is 180° about the origin:

The original figure is in the 2nd quadrant, and the image is in the 4th quadrant, directly opposite the origin.
Line ST is directed to the northeast; line S'T' is directed to the southwest, in exactly the opposite direction.

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To find the angle of rotation, you can look at the angle formed by a point, the center of rotation, and the image of the original point. Here, the angle UOU' is a straight angle, so the angle of rotation about O is 180°--the measure of that angle. (It can be convenient to use points close to the center of rotation, but any corresponding points on preimage and image will do.)

4 0

2 years ago

Solve this quadratic equation using the quadratic formula x^2 + 8x - 5 = 0