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tatiyna
2 years ago
7

Please help me with this , it would mean alot​

Mathematics
1 answer:
algol [13]2 years ago
4 0

Answer:

Step-by-step explanation:

21-26. a = v - u / t

=> a = 47 - 19 / 5

=> a = 28 / 5

=> a = 5.6 m/s²

27-32. avg. speed = distance / time

=> 40 m / 10 s

=> 4 m/s

33-38. velocity = distance / time

=> v = 150 / 40

=> v = 15 / 4

=> v = 3.75 m/s

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A source of information randomly generates symbols from a four letter alphabet {w, x, y, z }. The probability of each symbol is
koban [17]

The expected length of code for one encoded symbol is

\displaystyle\sum_{\alpha\in\{w,x,y,z\}}p_\alpha\ell_\alpha

where p_\alpha is the probability of picking the letter \alpha, and \ell_\alpha is the length of code needed to encode \alpha. p_\alpha is given to us, and we have

\begin{cases}\ell_w=1\\\ell_x=2\\\ell_y=\ell_z=3\end{cases}

so that we expect a contribution of

\dfrac12+\dfrac24+\dfrac{2\cdot3}8=\dfrac{11}8=1.375

bits to the code per encoded letter. For a string of length n, we would then expect E[L]=1.375n.

By definition of variance, we have

\mathrm{Var}[L]=E\left[(L-E[L])^2\right]=E[L^2]-E[L]^2

For a string consisting of one letter, we have

\displaystyle\sum_{\alpha\in\{w,x,y,z\}}p_\alpha{\ell_\alpha}^2=\dfrac12+\dfrac{2^2}4+\dfrac{2\cdot3^2}8=\dfrac{15}4

so that the variance for the length such a string is

\dfrac{15}4-\left(\dfrac{11}8\right)^2=\dfrac{119}{64}\approx1.859

"squared" bits per encoded letter. For a string of length n, we would get \mathrm{Var}[L]=1.859n.

5 0
2 years ago
90 divided by 5 in distributive property
makvit [3.9K]
Answer is 18 unless u wont it in letters
7 0
3 years ago
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Sophia Isabella share reward of $117 in a ratio of 1 to 8 what fraction of the total reward does Sophia get
Mars2501 [29]
$13 because Isabella will be awarded $104 making the ratio 1:8
3 0
3 years ago
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In ABC, BC=4 cm, angle b=angle c, and angle a=20 degrees, what is ac to two decimal places
zubka84 [21]

Answer:

Therefore,

AC=11.52\ cm

Step-by-step explanation:

Given:

In ΔABC, BC=4 cm,

angle b=angle c, and

angle a=20°

To Find:;

AC = ?

Solution:

Triangle sum property:

In a Triangle sum of the measures of all the angles of a triangle is 180°.

\angle a+\angle b+\angle c=180\\\therefore 2m\angle b =180-20=160\\m\angle b=\dfrac{160}{2}=80\°

We know in a Triangle Sine Rule Says that,  

In Δ ABC,

\dfrac{a}{\sin A}= \dfrac{b}{\sin b}= \dfrac{c}{\sin C}

substituting the given values we get

\dfrac{BC}{\sin a}= \dfrac{AC}{\sin b}

\dfrac{4}{\sin 20}= \dfrac{AC}{\sin 80}\\\\AC=11.517=11.52\ cm

Therefore,

AC=11.52\ cm

8 0
3 years ago
Read 2 more answers
КУ
Tatiana [17]

Answer:

3

Step-by-step explanation:

The dilation factor is 3

8 0
3 years ago
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