-1
If you mean (5, 2) then it is in the 1st quadrant on the Cartesian plane
If you mean the point (7, 9) then it is in the 1st quadrant
It is in the 4th quadrant moving anti-clockwise from the 1st quadrant
Quadrant 3 Quadrant 4 Quadrant 2 Quadrant 1
The point (2, 3) is located in the 1st quadrant
-1
The point (8,0) is on an axis (abscissa axis or x-axis) and is therefore not in a quadrant.
If you mean (5, 2) then it is in the 1st quadrant on the Cartesian plane
If you mean the point (7, 9) then it is in the 1st quadrant
2
If A is in quadrant IV, then A/2 is in quadrant II. Yes, the fact than cos(A) is 0.1 means that A is in quadrant I or IV, but it really is not required in order to answer the question. It is superfluous.
If you mean point (2, 5) then it is in the 1st quadrant on the Cartesian plane
It is in the 4th quadrant moving anti-clockwise from the 1st quadrant
6
Quadrant 3 Quadrant 4 Quadrant 2 Quadrant 1
In the first case the point has positive abscissa as well as ordinate, whereas in the second, the abscissa is negative. But nothing "happens". The world does not end!