Your answer is n=2. thank me if this helped you. :)
Answer:
16
Step-by-step explanation:
area of a triangle = 1/2 base x height
56.4 = 1/2 x 12 x height
56.4 = 6 x height
height = 56.4 /6 = 9.4cm
4/7 is the answer.
I cant reall explain becuase it will take forever xD