The length of MN is 15 units
The triangle is an isosceles triangle.
So, we have:
[tex]MN = ML[/tex]
Substitute values for MN and ML
[tex]3x = x + 10[/tex]
Subtract x from both sides
[tex]2x = 10[/tex]
Divide by 2
[tex]x = 5[/tex]
Recall that:
[tex]MN = x +10[/tex]
So, we have:
[tex]MN = 5 +10[/tex]
[tex]MN = 15[/tex]
Hence, the length of MN is 15 units
Read more about isosceles triangles at:
https://brainly.com/question/1475130
