^ if you're talking universally, no it would be cm. But no one really says "quarter inches". You would just say inches
It is nonlinear because X is being raised to the second power
Planes X and Y are perpendicular to each other
Points A, E, F, and G are points only in plane X
Points R and S are points in both planes X and Y
Lines EA and FG are parallel
The lines which could be perpendicular to RS are EA and FG.
The answer to your question is x = 8