The perpendicular distance of the point $(3, 4, 5)$ from the $y$-axis is

Let $A, B, C$ be the feet of the perpendiculars from a point $P$ on the $xy, yz,$ and $zx$-planes respectively. Find the coordinates of $A, B, C$ for the following points $P$:
$(3, 4, 5), (-5, 3, 7), (4, -3, -5)$

From which of the following is the distance of the point $(1, 2, 3)$ equal to $\sqrt{10}$?

Find the distance between the following pairs of points: $(-1, 3, -4)$ and $(1, -3, 4)$.

$A$ point $(x, y, z)$ moves parallel to the $x$-axis. Which of the three variables $x, y, z$ remain fixed?

The distance between the points $(1, 3, 2)$ and $(2, 1, 3)$ is: