- Astronomy question on terrestrial worlds. Which of the following apply?

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Find values of x for which 4x^4+12x^3-19x^2+8x-1>=0
2.solve z-x-y=6 x^2+y^2+z^2=14 z^3-x^3-y^3=36 for values of x,y,z(unique soln)? A spray can containing gas should be kept away from fire, in terms of kinetic particle theory, explain? Lim x→0 (tan x - sin x) / (x - x cos 4x) ? Advanced Engineering Mathematics Question. Any help is appreciated.? I need help w/ a complicated Pythagorean Theorem prob.This box won't allow me to put the whole question but I can comment it. Help please!?