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rusak2 [61]
3 years ago
13

What’s the square root of 4

Mathematics
2 answers:
Margarita [4]3 years ago
5 0

Answer: 2

Step-by-step explanation:

Alina [70]3 years ago
3 0

Answer:

2

Step-by-step explanation:

To find square root, you have to find out what number times itself will create the square root value:

\sqrt{4} means that there has to be a number that times itself to get 4.

2*2=4

Meaning that 2 is the perfect choice for this question.

\sqrt{4} = 2

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Researchers randomly choose two groups from 15 volunteers. Over a period of 9 weeks, one group watches television before going t
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Answer: B. Controlled experiment

Step-by-step explanation:

This is a controlled experiment because the variables in the question are manipulated by the researcher. We are told that while one group watches television before going to sleep, the other group does not.

The controllers won't have control over the variables that were used if it was an observational study while for a survey, it has to do with collection of information regarding certain topics or happenings in order to have people's perception on the topic or area of interest.

3 0
3 years ago
A farmhouse shelters 8 animals. Some are sheep and some are geese. Altogether there are 20 legs. How many of each animal are the
Novosadov [1.4K]

Answer:

I think they have 2, I could be wrong though

Step-by-step explanation:

4 0
3 years ago
Read 2 more answers
(1 point) Find the length traced out along the parametric curve x=cos(cos(4t))x=cos⁡(cos⁡(4t)), y=sin(cos(4t))y=sin⁡(cos⁡(4t)) a
Mazyrski [523]

The length of a curve C given parametrically by (x(t),y(t)) over some domain t\in[a,b] is

\displaystyle\int_C\mathrm ds=\int_a^b\sqrt{\left(\frac{\mathrm dx}{\mathrm dt}\right)^2+\left(\frac{\mathrm dy}{\mathrm dt}\right)^2}\,\mathrm dt

In this case,

x(t)=\cos(\cos4t)\implies\dfrac{\mathrm dx}{\mathrm dt}=-\sin(\cos4t)(-\sin4t)(4)=4\sin4t\sin(\cos4t)

y(t)=\sin(\cos4t)\implies\dfrac{\mathrm dy}{\mathrm dt}=\cos(\cos4t)(-\sin4t)(4)=-4\sin4t\cos(\cos4t)

So we have

\displaystyle\left(\frac{\mathrm dx}{\mathrm dt}\right)^2+\left(\frac{\mathrm dy}{\mathrm dt}\right)^2=16\sin^24t\sin^2(\cos4t)+16\sin^24t\cos^2(\cos4t)=16\sin^24t

and the arc length is

\displaystyle\int_0^1\sqrt{16\sin^24t}\,\mathrm dt=4\int_0^1|\sin4t|\,\mathrm dt

We have

\sin(4t)=0\implies4t=n\pi\implies t=\dfrac{n\pi}4

where n is any integer; this tells us \sin(4t)\ge0 on the interval \left[0,\frac\pi4\right] and \sin(4t) on \left[\frac\pi4,1\right]. So the arc length is

=\displaystyle4\left(\int_0^{\pi/4}\sin4t\,\mathrm dt-\int_{\pi/4}^1\sin4t\,\mathrm dt\right)

=-\cos(4t)\bigg_0^{\pi/4}-\left(-\cos(4t)\bigg_{\pi/4}^1\right)

=(\cos0-\cos\pi)+(\cos4-\cos\pi)=\boxed{3+\cos4}

7 0
3 years ago
What is 2 1/6 * 1 1/4 equal too
timofeeve [1]
Hmmm idk if you want fractions but, 65/24 or 2 17/24 I think
6 0
3 years ago
Select the FALSE statement.
MrMuchimi

Here's the Answer,

=》sin 45º = cos 45º - <em><u>True</u></em>

=》sin 30º = cos 30° - <em><u>false</u></em>

=》cos 10º = sin 80° - <em><u>true</u></em>

=》sin 15° = cos 75° - <em><u>true</u></em>

8 0
3 years ago
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