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2 years ago

I WILL GIVE YOU BRAINLEST IF YOU ANSWER IT RIGHT IN 5 MINUTES!!!!!!! 20 POINTS!!

Mathematics

2 answers:

Lyrx [107]2 years ago

7 0

Answer: A

Step-by-step explanation: plz mark me brainliest

Tpy6a [65]2 years ago

7 0

Answer:

Step-by-step explanation:

(b)(1), .. 3.56x10-4 ... 2.26x10-1 ± 1.09x10-2 Bq/L (6.11x100 ± 2.95x10-1 ... 4.08x10-3 ... 1.95x10-2.

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Can someone help me with this question please

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3 years ago

What is the value of x? Help me please

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2 years ago

Whats the area of a circle that has a 8mm dimeter using 3.14 of pi

djyliett [7]

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50.24

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1 year ago

In the number 7725 which place contain digits where one digit is ten times as great as the other

Tcecarenko [31]

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3 years ago

Find the cross product of <img src="https://tex.z-dn.net/?f=-%20%5Cfrac%7B3%7D%7B4%7Dv" id="TexFormula1" title="- \frac{3}{4}v"

dsp73

For any scalars $c_1,c_2$ , we have

$c_1\mathbf v\times c_2\mathbf w=c_1c_2\mathbf v\times\mathbf w$

So

$\left(-\dfrac34\mathbf v\right)\times\left(-\dfrac12\mathbf w\right)=\dfrac38\mathbf v\times\mathbf w$

We have

$\mathbf v\times\mathbf w=\begin{vmatrix}\mathbf i&\mathbf j&\mathbf k\\-2&12&-3\\-7&4&-6\end{vmatrix}$
$=\begin{vmatrix}12&-3\\4&-6\end{vmatrix}\mathbf i-\begin{vmatrix}-2&-3\\-7&-6\end{vmatrix}\mathbf j+\begin{vmatrix}-2&12\\-7&4\end{vmatrix}\mathbf k$
$=-60\,\mathbf i-(-9)\,\mathbf j+76\,\mathbf k$
$=\begin{bmatrix}-60\\9\\76\end{bmatrix}$

which makes

$\left(-\dfrac34\mathbf v\right)\times\left(-\dfrac12\mathbf w\right)=\dfrac38\begin{bmatrix}-60\\9\\76\end{bmatrix}=\begin{bmatrix}-\frac{45}2\\\\\frac{27}8\\\\\frac{57}2\end{bmatrix}$

4 0

3 years ago