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Stolb23 [73]
3 years ago
5

13.If one-seventh of a number minus 5 is 4, then the number isRequired to answer.​

Mathematics
1 answer:
miv72 [106K]3 years ago
6 0

Answer:

Step-by-step explanation:

63

1/7x-5=4

1/7x=9

X=63

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. A triangle has side lengths of 8, 7, and 14. To the nearest tenth of a degree find the measure of the angle opposite the side
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Given:

The measure of three sides of a triangle are 8, 7 and 14.

To find:

The measure of the angle opposite the side of length 8.

Solution:

According to the Law of Cosine:

\cos A=\dfrac{b^2+c^2-a^2}{2bc}

Let a=8, b=7 and c=14, then by using Law of Cosine, we get

\cos A=\dfrac{7^2+14^2-8^2}{2(7)(14)}

\cos A=\dfrac{49+196-64}{196}

\cos A=\dfrac{181}{196}

Taking cos inverse on both sides.

A=\cos^{-1}\dfrac{181}{196}

A=22.561328

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Therefore, the measure of the angle opposite the side of length 8 is 22.6 degrees.

7 0
3 years ago
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BartSMP [9]
Answer: B
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-5x+10>-15 = x<3/10
3 0
2 years ago
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