Answer:
4 units
Explanation:
MN is equal to ML because the triangle is an isosceles triangle.
MN = x + 3
ML = 4x
Since MN equals ML, then...
x + 3 = 4x
3 = 3x
1 = x
Now that you know the value of x, you can plug in this value to the equation.
MN = (1) + 3
MN = 4
So, MN equals 4 units which is letter choice A.