Answer: See below
Explanation :
Area of 1 triangle:
A = (12 x 5)/2 = 60/2 = 30
Area of 6 triangle:
30 x 6 = 180in^2
Solve for y:
x + y = 0
Subtract x from both sides:
Answer: y = -x
Answer:
I believe its D
Step-by-step explanation:

is the second or third Pythagorean triple on the list, which gives us the answer directly.
But if we didn't know that, let x be the short leg:




Rejecting the negative root, x=5, other side 12, the Pythagorean triple we found.