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GalinKa [24]
3 years ago
11

A class is made up of 4 boys and 10 girls. Half of the boys wear glasses. A student is selected at random from the class. What i

s the probability that the student is a boy with glasses?
Mathematics
1 answer:
Makovka662 [10]3 years ago
4 0
2/14 i have to get brainliest please

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Use completing the square to determine which of the following gives the solutions to 3x2 - 24x + 40 = 28.
jeka94

Answer:

x=4+2\sqrt{3}

x=4-2\sqrt{3}

Step-by-step explanation:

<u>Completing the square</u>

when  ax^2+bx+c=0

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3x^2-24x+40=28

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\implies 3x^2-24x=-12

Divide both sides by 3:

\implies x^2-8x=-4

Add the square of half the coefficient of x to both sides:

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\implies x^2-8x+16=-4+16

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Square root both sides:

\implies x-4=\pm\sqrt{12}

Add 4 to both sides and simplify the radical:

\implies x=4\pm\sqrt{4 \cdot 3}

\implies x=4\pm\sqrt{4}\sqrt{3}

\implies x=4\pm2\sqrt{3}

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2 years ago
Help me!! Which statement is correct?
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