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Sunny_sXe [5.5K]

3 years ago

11

Select the expressions that are equivalent to 7(x+2).

1 answer:

OlgaM077 [116]3 years ago

3 0

Answer:

5

Step-by-step explanation:

7-2=x

7-2=5

x=5

.........................

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Can you help me plz do it asap

Nina [5.8K]

The answer is (-4,-3)

6 0

2 years ago

According to 2015 census data, 42.7 percent of Colorado residents were born in Colorado. If a sample of 250 Colorado residents i

stepladder [879]

Answer:

$sd(X)=\sqrt{np(1-p)}=\sqrt{250*0.427*(1-0.427)}=7.82$

The best option is:

B.7.82

Step-by-step explanation:

Previous concepts

The binomial distribution is a "DISCRETE probability distribution that summarizes the probability that a value will take one of two independent values under a given set of parameters. The assumptions for the binomial distribution are that there is only one outcome for each trial, each trial has the same probability of success, and each trial is mutually exclusive, or independent of each other".

Data given

$p_C$ represent the real population proportion for residents born in Colorado

$\hat p_C =0.427$ represent the estimated proportion for rsidents born in Colorado

$n_C=250$ is the sample size selected

Solution to the problem

Let X the random variable of interest (number of residents in the sample), on this case we now that:

$X \sim Binom(n=250, p=0.427)$

The probability mass function for the Binomial distribution is given as:

$P(X)=(nCx)(p)^x (1-p)^{n-x}$

Where (nCx) means combinatory and it's given by this formula:

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

The expected value is given by this formula:

$E(X) = np=250*0.427=106.75$

And the standard deviation for the random variable is given by:

$sd(X)=\sqrt{np(1-p)}=\sqrt{250*0.427*(1-0.427)}=7.82$

The best option is:

B.7.82

8 0

3 years ago

Which best describes the error in solving the system of linear equations

Margarita [4]

"Only the x-value is given".

3 0

3 years ago

Read 2 more answers

Which function has the given properties below? The domain is the set of all real numbers.

shusha [124]

Answer: The function could be y= - 3 cos x

Solution:

One x-intercept is (pi/2,0): We can use a trigonometric function like cosine that has x-intercept (pi/2,0).

The domain of the cosine function is the set of all real numbers.

The maximum value is 3, then the amplitude must be 3: y = 3 cos x

The y-intercept is (0,-3) then it is the functio y = 3 cos x, reflected around the x-axis: y = - 3 cos x

7 0

4 years ago

Read 2 more answers

Answer it pls option c

Troyanec [42]

Answer:

$x = \frac{1}{4}$

Step-by-step explanation:

$\frac{x}{2} +\frac{3}{4} =\frac{7}{8}$

→ Find the LCM of the denominators (2,4 and 8)

LCM = 8

→ Multiply the whole equation by 8 to get rid of the fractions

4x + 6 = 7

→ Minus 6 from both sides to isolate 4x

4x = 1

→ Divide both sides by 4 to isolate x

$x = \frac{1}{4}$

5 0

3 years ago

Read 2 more answers