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3 years ago

Ignore 22. Only 20 and 21

Mathematics

1 answer:

Vedmedyk [2.9K]3 years ago

8 0

The first one should be read as between 75 and 97 inclusive. That means you are using ≤

75 ≤ x ≤ 97 As a compound inequality this is

75 ≤ x ; x ≤ 97

The second one is just a bit harder. That's because a place in Ohio probably could go down to - 36. Again, both ends of the inequality use ≤

-36 ≤ x ≤ 20 As a compound inequality

-36 ≤ x; x ≤ 20

I'm not sure if you should be including units like 20°F. If you are, add them in.

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3 years ago

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Answer:

The answer is No.4

Step-by-step explanation:

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3 years ago

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DaniilM [7]

Assuming $\mathbf a,\mathbf b\in\mathbb R^3$ , you have

$\mathbf a\cdot\mathbf b=(14)(-4)+(0)(8)=-56$

so

$((\mathbf a\cdot\mathbf b)\,\mathbf i)\cdot\mathbf a=(-56\,\mathbf i)\cdot(14\,\mathbf i)=(-56)(14)=-784$

Next,

$\mathbf a+\mathbf b=(14\,\mathbf i)+(-4\,\mathbf i+8\,\mathbf j)=10\,\mathbf i+8\,\mathbf j$

Then

$(\mathbf a+\mathbf b)\times\mathbf b=\begin{vmatrix}\mathbf i&\mathbf j&\mathbf k\\10&8&0\\-4&8&0\end{vmatrix}=112\,\mathbf k$

$((\mathbf a+\mathbf b)\times\mathbf b)\times\mathbf k=\begin{vmatrix}\mathbf i&\mathbf j&\mathbf k\\0&0&112\\0&0&1\end{vmatrix}=\mathbf 0$

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3 years ago

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gayaneshka [121]

Answer: x^2 + 40x

Nothing can further be done with the topic.....

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3 years ago