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3 years ago

What´s the answer to this expression 6/2(2+1)

Mathematics

2 answers:

Setler [38]3 years ago

8 0

The answer is 9.

Hope this helps :)

Sliva [168]3 years ago

7 0

You answer should be 9

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What is the equation of the blue line?

zaharov [31]

Answer: y = 3x + 2

Step-by-step explanation:

$\dfrac{x-x_{1} }{x_{2} -x_{1} } =\dfrac{y-y_{1} }{y_{2} -y_{1} }\\$

Let's choose two arbitrary points on the graph.

For example, let these be points with coordinates (1, 5) and (2, 8).

Substitute the coordinates of these points into the above formula and derive the equation of a straight line.

$\dfrac{x-1}{2-1} =\dfrac{y-5}{8-5}\\\\\dfrac{x-1}{1} =\dfrac{y-5}{3}\\\\3(x-1)=y-5\\3x-3=y-5\\y=3x-3+5\\y=3x+2$

7 0

3 years ago

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4 Find a formula for the exponential function passing through the points (-2, 4/9) and (3, 108)

NemiM [27]

9514 1404 393

Answer:

f(x) = 4·3^x

Step-by-step explanation:

We assume the function will be of the form ...

f(x) = a·b^x

Substituting the given values, we can find 'a' and 'b'.

4/9 = a·b^(-2)

108 = a·b^3

Dividing the second equation by the first gives ...

108/(4/9) = b^(3 -(-2))

243 = b^5

b = 3 . . . . . . 5th root

Using the second equation, we can find 'a':

108 = a·3^3 = 27a

a = 108/27 = 4

The formula for the exponential function is ...

f(x) = 4·3^x

3 0

3 years ago

The time spent waiting in the line is approximately normally distributed. The mean waiting time is 6 minutes and the variance of

White raven [17]

Answer:

0.3075 = 30.75% probability that a person will wait for more than 7 minutes.

Step-by-step explanation:

Problems of normally distributed samples are solved using the z-score formula.

In a set with mean $\mu$ and standard deviation $\sigma$ , the zscore of a measure X is given by:

$Z = \frac{X - \mu}{\sigma}$

The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the pvalue, we get the probability that the value of the measure is greater than X.

The standard deviation is the square root of the variance.

In this problem, we have that:

$\mu = 6, \sigma = \sqrt{4} = 2$

Find the probability that a person will wait for more than 7 minutes.

This is 1 subtracted by the pvalue of Z when X = 7. So

$Z = \frac{X - \mu}{\sigma}$

$Z = \frac{7 - 6}{2}$

$Z = 0.5$

$Z = 0.5$ has a pvalue of 0.6915

1 - 0.6915 = 0.3075

0.3075 = 30.75% probability that a person will wait for more than 7 minutes.

7 0

3 years ago

PLEASE HELP ASAP ILL GIVE BRAINLIEST IF CORRECT

shepuryov [24]

So first of all you can find x and y because all triangles have interior angles that add up to 180 degrees.

X= 10 degrees
Y= 60 degrees

Looking at the options, we see that the first statement is true. And if the angles are not equal, the triangles are not able to be similar.

6 0

2 years ago

34) -3(5 + 2x) - 7 distribute

vitfil [10]

Answer:

-22-6x

Step-by-step explanation:

Multiply, leave -7 out. Then combine like terms.

5 0

2 years ago

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