Tell which quadrant each of the following points is located in: I, II, III, or IV.
11. (20, 10) -
10. (-9,17) -
9. (15, -12)
13. (30,-8)
12. (-6, -23)
14. (-5.-5)
16. (-14,-2)
17. (-8, 35)
15. (18, 10)
Can anyone help me I did not know how to do it

11.Quadrant 1 10.quadrant II 9. IV 13. IV 12. III 14. III 16: III 17: II 15 I

Step-by-step explanation:

this should help https://socratic.org/questions/what-is-the-order-of-quadrants-in-a-graph  just look at the coordinates x and y if they correspond to which quadrant.

assuming you mean addition: addition and subtraction are reverse operations.

step-by-step explanation:

-2

7 - 9 = -2

reversed:

-2 + 9 = 7