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faust18 [17]
3 years ago
15

Please help due at 8:00

Mathematics
2 answers:
goblinko [34]3 years ago
7 0

Answer:

x = 6

Step-by-step explanation:

Tangent - Secant Power Theorem: 18^2 = 12(21 + x)

324 = 252 + 12x

72 = 12x

x = 6

olga55 [171]3 years ago
3 0

Answer:

x=6

Step-by-step explanation:

(whole secant) x (external part) = (tangent)^2

(12+x+9)*12 = 18^2

(21+x)12 =324

Divide each side by 12

(21+x) 12/12 = 324/12

21+x = 27

Subtract 21 from each side

21+x-21 =27-21

x=6

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the correlation between two variables related to the same sample is a scaled quantitative measure. what is used to scale this me
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The correct option is the standard deviations of the variables.

What is correlation?

Any statistical relationship between two random variables or bivariate data, whether causal or not, is referred to in statistics as correlation or dependence.

Correlation is a term used to describe the linear relationship between two entities. When using a correlation tool, the variables must be present in quantities of two or more to test their relationship (degree of association).

In order to scale the measurement between two variables connected to a similar sample, the standard deviation measures dispersion.

The variables' standard deviations are the best choice as a result.

Option involving the standard errors of the variables is incorrect because standard error, which stands for standard deviation, determines the relationship between dependent and independent variables.

Option involving the coefficients of variation of two variables is incorrect because the coefficient expressing standard deviation and mean ratio determines how much variation there is.

Option The means of the variables are incorrect because they are not a scale for determining the correlation between two variables.

Hence, the correct option is the standard deviations of the variables.

To know more about correlation, click on the link

brainly.com/question/2088651

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Complete question:

The correlation between two variables related to the same sample is a scaled quantitative measure. What is used to scale this measurement?

- the standard deviations of the variables

- the standard errors of the variables

- the coefficients of variation of the two variables

- the means of the variables

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