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inessss [21]
3 years ago
6

Solve the compound inequality 7x ≥ –56 and 9x < 54

Mathematics
1 answer:
Reptile [31]3 years ago
5 0

Answer:

For the first inequality-   (-8)

Second inequality-    6

Step-by-step explanation:

First inequality- divide both sides by 7.

Second inequality- divide both sides by 9

Hope this helps ^-^

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Find the exact value of cos 157.5°.
Nonamiya [84]
Cos 157.5º=-cos (180º-157.5º)=-cos 22.5=-cos(45/2)

cos Ф/2=⁺₋√((1+cosФ)/2).

In this case 157.5º is in the second quadrant, therefore we use the following equation:
cos Ф/2=-√((1+cosФ)/2).          (we will have a negative number)

cos 157.5º=-cos (45/2)=-√((1+cos 45º)/2)
=-√((1+√2/2)/2)
=-√((2+√2)/4)
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Answer: cos 157.5º= -√(2+√2) / 2

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3 years ago
What is the answer to this
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Hello!

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90 - 10 = 80

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\frac{80}{4} =  \frac{4x}{4}]

\framebox{x = 20 \°}
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