Answer:
JK = 10.524
LK = 21.065
Explanation:
all angles in a triangle add up to 180, so angle K = 42.
law of sines states that 
, where capital letters are side lengths and lower case letters are the angles opposite their corresponding capital letter sides. 
in this case:
 -----> JK = 
 = 10.524
and 
 -----> LK = 
 = 21.065