exam Maths Puzzle Numerical Ability

2z+x=11.5

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exam Other Question

Factor completely. If it is prime, say so.

20a^3-25a^2b+8ab^2-10b^3 solve the following system of equtions and give the general solution in parametric vector form.

x+y-2z=6
3y+z-w=3
-2x+y+2z-w=9