exam Maths Puzzle Numerical Ability

please help me
let f(X)=x/6 , x=1,2,3,zero elsewhere be the pdf of x , find the distribution function and the pdf of y=x^2

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exam Other Question

use row operation to solve the system of linear equation

[2x - x + x | 6]
[x + x + x + 2x | 0]
[2x + x - x + x | -3]
[ x +2x +2x + x |-9]

I set it up lik Find the length of the major and minor axes of an ellipse with the equation 16x2 + 25y2 + 32x - 150y = 159