Answer:joe
Step-by-step explanation:
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45
KL = 12 because the triangle is isosceles ( base angles are congruent)
KJ = JM = 12 because the triangle is equilateral ( all angles are equal 60°)
the perimeter is
P = 9 + 12 + 12 +12 = 9 +36 = 45
-4 + x = 0
Add 4 to both sides:
x = 4
The answer is d) 4