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3 years ago

PLEASE PLEASE PLEASE HELP ASAP grade 9 work best answer gets brainliest :)

Mathematics

2 answers:

skelet666 [1.2K]3 years ago

7 0

For number 13 x=70 and y=115 hope this helped

miss Akunina [59]3 years ago

4 0

Number 13
X=70 and y=125

Here we can find x by the property of linear pair
And y by angle sum property for parallelogram

Number 14

X=30

We can use angle sum property here

So 2x+3x+x=180
6x=180
X=180/6
X= 30

Hope it helps
And don’t forget to mark as brainliest

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Mashcka [7]

Answer:

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Step-by-step explanation:

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2 years ago

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Step-by-step explanation:

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2 years ago

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Colt1911 [192]

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Step-by-step explanation:

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3 years ago

I can't figure out how to do (i + j) x (i x j)for vector calc

Vinil7 [7]

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$\begin{gathered} \vec{A}=a_1\hat{i}+a_2\hat{j}+a_3\hat{k} \\ \vec{B}=b_1\hat{i}+b_2\hat{j}+b_3\hat{k} \\ \Rightarrow\vec{A}\times\vec{B}=\det (\begin{bmatrix}{\hat{i}} & {\hat{j}} & {\hat{k}} \\ {a_1} & {a_2} & {a_3} \\ {b_1} & {b_2} & {b_3}\end{bmatrix}) \end{gathered}$

Then, solving the determinant

$\Rightarrow\vec{A}\times\vec{B}=(a_2b_3-b_2a_3)\hat{i}+(b_1a_3+a_1b_3)\hat{j}+(a_1b_2-b_1a_2)\hat{k}$

In our case,

$\begin{gathered} (\hat{i}+\hat{j})=1\hat{i}+1\hat{j}+0\hat{k} \\ \text{and} \\ (\hat{i}\times\hat{j})=(1,0,0)\times(0,1,0)=(0)\hat{i}+(0)\hat{j}+(1-0)\hat{k}=\hat{k} \\ \Rightarrow(\hat{i}\times\hat{j})=\hat{k} \end{gathered}$

Where we used the formula for AxB to calculate ixj.

Finally,

$\begin{gathered} (\hat{i}+\hat{j})\times(\hat{i}\times\hat{j})=(1,1,0)\times(0,0,1) \\ =(1\cdot1-0\cdot0)\hat{i}+(0\cdot0-1\cdot1)\hat{j}+(1\cdot0-0\cdot1)\hat{k} \\ \Rightarrow(\hat{i}+\hat{j})\times(\hat{i}\times\hat{j})=1\hat{i}-1\hat{j} \\ \Rightarrow(\hat{i}+\hat{j})\times(\hat{i}\times\hat{j})=\hat{i}-\hat{j} \end{gathered}$

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11 months ago

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marin [14]

Answer:

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Step-by-step explanation:

I did the math and this is what I got

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2 years ago

PLEASE PLEASE PLEASE HELP ASAP *grade 9 work* best answer gets brainliest :)

PLEASE PLEASE PLEASE HELP ASAP grade 9 work best answer gets brainliest :)