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3 years ago

The difference of twice a number and 9.

Mathematics

2 answers:

mart [117]3 years ago

6 0

Answer:

2(9-x)

Step-by-step explanation:

const2013 [10]3 years ago

5 0

Answer:

2n - 9

Step-by-step explanation:

Twice a number is referring to 2 times n or just 2n. To find the difference you would subtract 2n and 9, 2n - 9

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Vesnalui [34]

Hello,

$\boxed{P(X = k) =( {}^{n} _{k}) \times p {}^{k} \times (1 - p) {}^{n - k} }$

$P(X= k) = ( {}^{12} _{6}) \times 0.51 {}^{6} \times (1 - 0.51) {}^{12 - 6}$

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$( {}^{12} _{6}) = \frac{12!}{6!(12 - 6)!} = \frac{12!}{6!6!} = \frac{12 \times 11 \times 10 \times ... \times 1}{2(6 \times 5 \times 4 \times... \times 1) } = \frac{12 \times 11 \times 10 \times 9 \times 8 \times 7 }{6 \times 5 \times 4 \times 3 \times 2 \times 1} = 924$

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