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Answer:
4
Step-by-step explanation:
Given the following
JK = 2x,
KL = 6, and
JL = 4x,
The following postulate is true
JK + KL = JL
Substitute
2 + 6 = 4x
8 = 4x
x = 8/4
x = 2
Since JK = 2x
JK = 2(2)
JK = 4
Hence JK is 4