The distance of the point $(0, -6)$ from the origin is $\ldots \ldots \ldots$

Point $(2.8, 4.9)$ lies in the $\ldots \ldots$ quadrant.

In which quadrant or on which axis does each of the following points lie?
$A(5, 0), B(3, -2), C(-2, 5), D(0, 4), E(-3, -4), F(4, 3), G(0, -4), H(-5, 0)$
Verify your answer by locating them on the Cartesian plane.

Which quadrant does the interior of $\angle X^{\prime}OY^{\prime}$ represent?

If the point $(a, 0)$ is on the ray $OX^{\prime}$,is $a$ a positive number or a negative number?

Signs of the abscissa and ordinate of a point in the second quadrant are respectively