Soo what do you need help with? It seems pretty easy. I can help you if you want.
This is the answer 7 x -3
7 x -3 = -21
Answer:

Step-by-step explanation:
we know that two similar triangles will have ratio corresponding side is same.
ratio triangle 1 is 75m^2.
and triangle 2 is 12m^2.

so we have ratio of area
.
ratio of perimeter will be
.
from these perimeter ratio also
.