Answer:
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Step-by-step explanation:

Distribute 2 through the parentheses
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Move constant to right hand side and change it's sign
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Calculate
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Divide both sides of the equation by 12
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Calculate
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Hope I helped!
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Answer:
john has a 6 out of 10 chance of picking a pencil
Answer:
The number of protons
Step-by-step explanation:
Its the correct answer
4x^2 = 100
x^2 = 25
x = + or - 5
x = 5 or x = -5
Hope this helps.
Answer:
The length of BC is 17
Step-by-step explanation:
When we construct a triangle with the data, we will end up a isosceles triangle.
In a isosceles triangle , we know that tow angles and two sides are equal
The questions states that

Then sides AC and AB are also equal
On equation their values
2X - 8 = X+9
2X = X + 9 +8
2X = X + 17
2X - X = 17
X = 17
The length of BC = X = 17