Answer:
1554
Step-by-step explanation:
PEMDAS
42[13+4(6)]
42[13+24]
42(37)
1554
2,3,8
2,8,3
3,8,2
3,2,8
8,2,3
8,3,2
6 triangles.
Technically the answer is both A and C, because you can see it as (x-8)^1, meaning 8 to the right, or just x-8, meaning 8 down.