exam Maths Puzzle Numerical Ability

A line L through the origin in R^3 can be represented by parametrix equations of the form x = at, y = bt, z = ct. Use these equations to show that L is a subspace of R^3; that is

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Below are average gestation days and longevity data for 22 animals. (a) Make a scatter plot.
(b) Find the correlation coefficient and interpret it. (c) Test the correlation coeffi how do i do this problem......how do i find the partial fraction decomposition for the rational expression.

-2x^2+4x-7
__________

(x^2+4)^2