The coordinates of 3 points are A(-1,-6), B(3,-12) and C(k, 6). Find the value of k if
(a) A, B and C are collinear
(b) AB is perpendicular to AC.​

What is the area of the original rectangle? 8 cm² 20 cm² 25 cm² 40 cm²

The angles in a triangle are represented by 5x, 8x, and 2x+9. what is the value of ? a.10.8 b.11.4 c.9.7 d.7.2

In a small section of a stadium there are 40 spectators watching a game between the cook islands and fiji. they all support at least one of the two teams. 25 spectators support the cook islands and 16 of these support both teams. how many support only fiji?