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3 years ago

Distribute -2(6x^2+6)

Mathematics

2 answers:

borishaifa [10]3 years ago

5 0

Answer:

-12x^2-12

Step-by-step explanation:

BabaBlast [244]3 years ago

3 0

Answer:

-12

Step-by-step explanation:

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3 years ago

In a class of 100 students, 25 have hardcover and 75 students have paperback textbooks. If you randomly choose 15 students in th

Gnom [1K]

Answer:

23.72% probability that 3 of them have hardcover texts.

Step-by-step explanation:

A probability is the number of desired outcomes divided by the number of total outcomes.

The order in which the students are chosen is not important. So we use the combinations formula to solve this question.

Combinations formula:

$C_{n,x}$ is the number of different combinations of x objects from a set of n elements, given by the following formula.

$C_{n,x} = \frac{n!}{x!(n-x)!}$

If you randomly choose 15 students in this class, find the probability that 3 of them have hardcover texts.

Desired outcomes:

3 with hardcover texts, from a set of 25.

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$D = C_{25,3}*C_{75,12} = \frac{25!}{3!(22)!}*\frac{75!}{12!(63)!} = 6 \times 10^{16}$

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15 students from a set of 100. So

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Probability:

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23.72% probability that 3 of them have hardcover texts.

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3 years ago