X/5+9=4
Subtract each side by 9
X/5=-5
Multiply each side by 5
X=-25
3/10=15/50 and then 8/25=16/50
So, 3/10<8/25
(5,12,13) is a right triangle and can be constructed.
All the others do not satisfy the triangle inequality, i.e. the sum of two short sides must exceed the long side in order for the triangle to be constructed.
Examples:
2+11<15, so no
3+7<11, so no
4+8<15, so no
but 5+12>13 so yes, it can be constructed.
The final answer that i got from this was -x-13
