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4 years ago

HELP ME FOR BRAINLIEST

Mathematics

2 answers:

Lelu [443]4 years ago

6 0

Answer: A. 91

Step-by-step explanation:

n = 14

r = 12

Formula = n! / ( (n-r)! × r! )

= 14! / ((14-12)! × 12!)

= ( 14 × 13 × 12! ) / ((2)! × 12!)

= ( 14 × 13 ) / 2!

= 91

adelina 88 [10]4 years ago

4 0

Answer:

Step-by-step explanation:

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9. A teacher places seven cards, lettered A-G, on

NNADVOKAT [17]

Answer:

Cards C and E

Step-by-step explanation:

Remember that irrational numbers cannot be written as a fraction of two integers:

Is 10 irrational? No, because 10 can be written as a fraction (ex. 10/1, 20/2, etc.)

Is 6/5 irrational? No, because it is a fraction.

Is π irrational? Yes, because it can't be written as a fraction as its digits continue infinitely without repetition.

Is 11/4 irrational? No, because it is a fraction.

Is 8.25635... irrational? Yes, because the ellipsis shows the digits continue infinitely without repetition, otherwise there would be a bar over the digits to show repetition

Is -7 irrational? No, because it can be written as a fraction (ex. -7/1, -14/2, etc.)

Is 6.31(bar) irrational? No, because the bar shows that the digits 3 and 1 repeat.

Therefore, only cards C and E are irrational.

3 0

3 years ago

Plsss help i need to know what is 20+60-5

bonufazy [111]

Answer:

20+60=80

80-5=75

as easy as that

4 0

3 years ago

What is the mean, median and mode of the following numbers?<br> 60, 10, 20, 30, 40, 60

n200080 [17]

Answer:

Mode: 60

Median: 30

Mean: 36.666

Step-by-step explanation:

4 0

2 years ago

Let X equal the number of typos on a printed page with a mean of 4 typos per page.

timama [110]

Answer:

a) There is a 98.17% probability that a randomly selected page has at least one typo on it.

b) There is a 9.16% probability that a randomly selected page has at most one typo on it.

Step-by-step explanation:

Since we only have the mean, we can solve this problem by a Poisson distribution.

In a Poisson distribution, the probability that X represents the number of successes of a random variable is given by the following formula:

$P(X = x) = \frac{e^{-\mu}*\mu^{x}}{(x)!}$

In which

x is the number of sucesses

e = 2.71828 is the Euler number

$\mu$ is the mean in the given time interval.

In this problem, we have that $\mu = 4$

(a) What is the probability that a randomly selected page has at least one typo on it?

Thats is $P(X \geq 1)$ . Either a number is greater or equal than 1, or it is lesser. The sum of the probabilities must be decimal 1. So:

$P(X < 1) + P(X \geq 1) = 1$

$P(X \geq 1) = 1 - P(X < 1)$

In which

$P(X < 1) = P(X = 0)$ .

$P(X = 0) = \frac{e^{-4}*4^{0}}{(0)!} = 0.0183$

$P(X \geq 1) = 1 - P(X < 1) = 1 - 0.0183 = 0.9817$

There is a 98.17% probability that a randomly selected page has at least one typo on it.

(b) What is the probability that a randomly selected page has at most one typo on it?

This is $P = P(X = 0) + P(X = 1)$ . So:

$P(X = 0) = \frac{e^{-4}*4^{0}}{(0)!} = 0.0183$

$P(X = 1) = \frac{e^{-4}*4^{1}}{(1)!} = 0.0733$

$P = P(X = 0) + P(X = 1) = 0.0183 + 0.0733 = 0.0916$

There is a 9.16% probability that a randomly selected page has at most one typo on it.

3 0

3 years ago

A triangle on a coordinate plane is translated according to the rule T-8.4(x, y). Which is another way to write this rule?

Alexxx [7]

Answer:

(x,y) -->(x - 8, y + 4)

Step-by-step explanation:

T(-8, 4) means left 8 and up 4

(x,y) -->(x - 8, y + 4)

7 0

4 years ago

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