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2 years ago

Simplify: 3x - 9 + 13x - 6

Mathematics

2 answers:

nikitadnepr [17]2 years ago

7 0

Hope this help u ...

Vilka [71]2 years ago

7 0

You can sum like terms. Two terms can be summed if they are both constants (i.e. pure numbers) or if they involve the same powers of the same variable.

In this case, 3x and 13x can be summed because they both involve 'x' alone. The sum is

$3x+13x = (3+13)x = 16x$

As for the other two terms, you simply have to sum two numbers, as usual:

$-9-6 = -15$

So, the final answer is

$16x-15$

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4. In a sample of 1000 people, 130 can wiggle their ears. Two unrelated people are

Elina [12.6K]

Using the hypergeometric distribution, it is found that there is a 0.7568 = 75.68% probability that neither can wiggle his or her ears.

The people are chosen from the sample without replacement, which is why the hypergeometric distribution is used to solve this question.

Hypergeometric distribution:

$P(X = x) = h(x,N,n,k) = \frac{C_{k,x}C_{N-k,n-x}}{C_{N,n}}$

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

The parameters are:

x is the number of successes.
N is the size of the population.
n is the size of the sample.
k is the total number of desired outcomes.

In this problem:

1000 people means that $N = 1000$
130 can wiggle their ears, thus $k = 130$
Two are selected, thus $n = 2$ .

The probability that neither can wiggle his or her ears is P(X = 0), thus:

$P(X = x) = h(x,N,n,k) = \frac{C_{k,x}C_{N-k,n-x}}{C_{N,n}}$

$P(X = x) = h(0,1000,2,130) = \frac{C_{130,0}C_{870,2}}{C_{1000,2}} = 0.7568$

0.7568 = 75.68% probability that neither can wiggle his or her ears.

A similar problem is given at brainly.com/question/24826394

5 0

1 year ago

The correct answer is...?

Elanso [62]

Answer:

The answer to both problems is GRAPH

I hope this helps:)

8 0

2 years ago

Evaluate the expression 4y/Yfor x=8 and y=0

jeyben [28]

To evaluate 4y/x for x=8 and y=0 we shall have:
4y/x=(4×0)/8
=0/8
=0
Answer; 0

8 0

2 years ago

What is the value of x in the equation 3-2x--15x? 6 2 2 6

Wittaler [7]

Consider the given equation is $3-2x=15$ and one of the 6 in the options is -6.

Given:

The equation is

$3-2x=15$

To find:

The value of x.

Solution:

We have,

$3-2x=15$

Subtracting 3 from both sides, we get

$3-2x-3=15-3$

$-2x=12$

Divide both sides by -2.

$x=\dfrac{12}{-2}$

$x=-6$

Therefore, the value of x is -6.

6 0

2 years ago

I need help my grade depends on your answer!!

Fynjy0 [20]

Answer:

Angle 4 and Angle 5 are congruent.

Step-by-step explanation:

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2 years ago