That is called an improper fraction.You multiply the whole numbers by the denominator and then add what is left over to get the improper fraction.
I believe the answer is the second one I am in the same class.
No, these do not always forma unique triangles because it depends on what size your sides are because if you have 3 sides of the same length then that’s a equilateral and if you have two sides of the same length and one side that’s not then that would be an Isosceles triangle and if you had no sides of the same length then that would be a scalene triangle.