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3 years ago

Can you plz help me i need it

Mathematics

1 answer:

Snowcat [4.5K]3 years ago

3 0

Answer:

v= -2

Step-by-step explanation:

2v + 7 = 3

(-7 both sides)

2v = -4

(divide bu 2 on both sides)

v = -2

hope this helps!!!!! :)

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Im sooo confused please help!

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3 years ago

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Natali5045456 [20]

Answer:

Step-by-step explanation:

5 0

3 years ago

Read 2 more answers

Find the obtuse angle between the following pair of straight lines.

ioda

Given:

$y=-2$

$y=\sqrt{3}x-1$

To find:

The obtuse angle between the given pair of straight lines.

Solution:

The slope intercept form of a line is

$y=mx+b$ ...(i)

where, m is slope and b is y-intercept.

The given equations are

$y=0x-2$

$y=\sqrt{3}x-1$

On comparing these equations with (i), we get

$m_1=0$

$m_2=\sqrt{3}$

Angle between two lines whose slopes are $m_1\text{ and }m_2$ is

$\tan \theta=\left|\dfrac{m_2-m_1}{1+m_1m_2}\right|$

Putting $m_1=0$ and $m_2=\sqrt{3}$ , we get

$\tan \theta=\left|\dfrac{\sqrt{3}-0}{1+(0)(\sqrt{3})}\right|$

$\tan \theta=\left|\dfrac{\sqrt{3}}{1+0}\right|$

$\tan \theta=\pm \sqrt{3}$

Now,

$\tan \theta= \sqrt{3}$ and $\tan \theta=-\sqrt{3}$

$\tan \theta= \tan 60^\circ$ and $\tan \theta=\tan (180^\circ-60^\circ)$

$\theta= 60^\circ$ and $\theta=120^\circ$

$120>90$ , so it is an obtuse angle and $60$ , so it is an acute angle.

Therefore, the obtuse angle between the given pair of straight lines is 120°.

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3 years ago

Reflect Rodrigo drew this diagram

12345 [234]

Ugh I hate math so much are you in 8th grade too?? I’m doing the same thing

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3 years ago

The most important characteristic of a sample that makes it possible to generalize the results of a research study to the popula

nlexa [21]

Answer:

C. The sample is carefully screened to ensure that it contains, proportionately, people with the same demographic profiles as encountered in the population.

Step-by-step explanation:

Sampling

This is a common statistics practice, when we want to study something from a population, we find a sample of this population.

When choosing a sample, you have to be careful, to avoid choosing a biased sample.

In this question:

Option A is not correct, as this wouldnt be representative of the entire population, since there is expected to be a significant number of people without these skills.

Option B is not correct, as we would not have a sample.

Option D is not correct, as a quickly selected sample could lead to bias.

Option E is not correct, as it could also lead to bias.

So the answer is given by option C.

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3 years ago