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dalvyx [7]
3 years ago
12

The correlation coefficient between two quantitative variables is 0.8. What does the value of this correlation coefficient indic

ate about how well the model fits the data? A. No conclusion can be drawn regarding how well the model fits the data. B. The correlation coefficient is not within the correct range. C. The model is not a good fit. D. The model is a good fit.
Mathematics
1 answer:
blsea [12.9K]3 years ago
8 0

Answer: D: the model is a good fit 100%

Step-by-step explanation:

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In triangle abc, the perimeter is 36, and ab=ac. line ad is perpendicular to bc at the point d, and triangle abd's perimeter is
Musya8 [376]
Let x=ab=ac, and y=bc, and z=ad.

Since the perimeter of the triangle abc is 36, you have:

Perimeter of abc = 36
ab + ac + bc = 36
x + x + y = 36
(eq. 1) 2x + y = 36

The triangle is isosceles (it has two sides with equal length: ab and ac). The line perpendicular to the third side (bc) from the opposite vertex (a), divides that third side into two equal halves: the point d is the middle point of bc. This is a property of isosceles triangles, which is easily shown by similarity.

Hence, we have that bd = dc = bc/2 = y/2 (remember we called bc = y).

The perimeter of the triangle abd is 30:

Permiter of abd = 30
ab + bd + ad = 30
x + y/2 + z =30
(eq. 2) 2x + y + 2z = 60

So, we have two equations on x, y and z:

(eq.1) 2x + y = 36
(eq.2) 2x + y + 2z = 60

Substitute 2x + y by 36 from (eq.1) in (eq.2):

(eq.2') 36 + 2z = 60

And solve for z:

36 + 2z = 60 => 2z = 60 - 36 => 2z = 24 => z = 12

The measure of ad is 12.

If you prefer a less algebraic reasoning:

- The perimeter of abd is half the perimeter of abc plus the length of ad (since you have "cut" the triangle abc in two halves to obtain the triangle abd).

- Then, ad is the difference between the perimeter of abd and half the perimeter of abc:

ad = 30 - (36/2) = 30 - 18 = 12
4 0
3 years ago
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20 POINTS!!!!!!!! A picture is photocopied by using a scale factor of 2. Each side of the photocopy of the picture is
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Answer:

Each side of the photocopy of the picture is  enlarged by a factor of 2 so it would be A.

Step-by-step explanation:

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2 years ago
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<span>The Complete pattern is 85,700, 8,570, 857, 85.7, 8.57, 0.857.It is nothing but just moving the decimal places to the right side.Otherwise each number should multiplied and divided by 10 so that we derived the complete pattern.When you multiply by moving the decimal point to the right, you also need to add a zero to the end of it. This is an alternative method for the pattern.</span>
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3 years ago
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What is the theoretical probability that a number cube will land on a 3?
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Answer:

1/3 is your answer

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The length of the hypotenuse of a right triangle is 145 units. The length of one leg of the triangle is 144. Mike wrote the foll
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Hi Vance :)

a=leg unknow
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