Answer:
One.
Step-by-step explanation:
The reason why is because 12-5 = 7, meaning that your lowest length has to be 7. meaning, that you can only do one triangle.
i think it's c, I could be wrong djxndnxmmx
5y + 3 > -7y + 13
12y > 10
y > 10/12
y > 5/6