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3 years ago

Find the sum and express it in simplest form. (3t2 + 6t + 1) + (-9t2 - 5t)

Mathematics

1 answer:

Sonbull [250]3 years ago

7 0

(3t^2 + 6t + 1) + (-9t^2 - 5t)
= 3t^2 + 6t + 1 -9t^2 - 5t
= -6t^2 + t + 1

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The Pearson's coefficient of correlation between the is 0.700.

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The correlation coefficient is a statistical degree that computes the strength of the linear relationship amid the relative movements of the two variables (i.e. dependent and independent).It ranges from -1 to +1.

The formula to compute correlation between two variables X and Y is:

$r(X, Y)=\frac{Cov(X, Y)}{\sqrt{V(X)\cdot V(Y)}}$

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$Cov(X, Y)=n\cdot \sum XY-\sum X \cdot\sum Y$

The formula to compute the variances are:

$V(X)=n\cdot\sum X^{2}-(\sum X)^{2}\\V(Y)=n\cdot\sum Y^{2}-(\sum Y)^{2}$

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Compute the variance of X and Y as follows:

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so 9x = 1296

and x = 144

It would take him 144 minutes to deliver 72 papers.

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