20 PIONTS ANSWER NOW DUE

15. A triangle pattern is shown below.

Figure Perimeter
1 triangle 24
2 triangles 30
3 triangles 36
Which equation relates the number of triangles in the figure (n) to the perimeter of the figure (P)?

(1 point)
P = 6n + 18
P = 9n + 6
P = 6n + 9
P = 9n + 12