Answer:
3 lengths that could be the lengths of a triangle are 3; 4; and 5.
Explanation:
To determine whether three lengths could be the sides of a triangle, you add two sides together to see if the sum is greater than the length of the last side. If this process is true for all three trials, then the lengths can be the sides of a triangle. If not, then it cannot be. In this case, 3 + 4 = 7 which is greater than 5, 3 + 5 = 8 which is greater than 4, and 4 + 5 = 9 which is greater than 3, so the lengths 3; 4; and 5 can be the lengths of a triangle.