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ikadub [295]
3 years ago
7

Two numbers have a difference of 4 and a sum of -8. What is their product?

Mathematics
1 answer:
Sati [7]3 years ago
7 0
Assume the two numbers are x and y 
the difference = 4 , so x - y = 4 
the sum = -8 , so x + y = -8 
by solving both equations 
2x = -4 
x = -2 
-2 + y = -8 
y = -6 
the two numbers are -2 and -6 
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enyata [817]

The correct option will be:  C) 0.84

<u><em>Explanation</em></u>

Formula for Correlation coefficient :

r= \frac{n(\Sigma xy)-(\Sigma x)(\Sigma y)}{\sqrt{[n\Sigma x^2-(\Sigma x)^2][n\Sigma y^2-(\Sigma y)^2]}}

First, for each point(x, y), we need to calculate x², y² and xy .

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<em>(Please refer to the attached image for the table )</em>

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4 0
3 years ago
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