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Nikitich [7]
4 years ago
6

Enter the number that belongs in the green box. 7x8x-12 x = [? ]

Mathematics
1 answer:
White raven [17]4 years ago
3 0

Answer:

x = 12

Step-by-step explanation:

These are vertical angles, and vertical angles are equal

7x = 8x-12

7x -8x = -12

-x = -12

x = 12

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Step-by-step explanation:

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3 years ago
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6 0
3 years ago
Read 2 more answers
At the Boston Marathon there were 20,000 runners who finished the race. Each runner ran a distance of 26 miles. If you add toget
andre [41]

Answer:

the runners have gone 20.8 times around the globe all together

Step-by-step explanation:

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Therefore, the total distance travelled by all runners combined is:

D=Nd=(20,000)(26)=5.2\cdot 10^5 mi

We know that the circumference of the Earth is

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Here we want to find how many times around the globe would the marathon runners have gone. This can be found by calculating the following ratio:

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4 0
3 years ago
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Kipish [7]

Answer:   \bold{-7+2\sqrt{14}+5\sqrt{7}-10\sqrt{2}}

<u>Step-by-step explanation:</u>

\dfrac{\sqrt7-5}{\sqrt7+\sqrt8}\bigg(\dfrac{\sqrt7-\sqrt8}{\sqrt7-\sqrt8}\bigg)=\dfrac{7-2\sqrt{14}-5\sqrt{7}+10\sqrt2}{7-8}=\dfrac{7-2\sqrt{14}-5\sqrt{7}+10\sqrt2}{-1}\\\\\\=\boxed{-7+2\sqrt{14}+5\sqrt{7}-10\sqrt2}

8 0
3 years ago
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