Someone please help! Will give brainliest and many points!

Answer:
JK = 2.4
Step-by-step explanation:
Since the figures are similar then the ratios of corresponding sides are equal, that is
[tex]\frac{JK}{AB}[/tex] = [tex]\frac{LM}{CD}[/tex], substitute values
[tex]\frac{JK}{4}[/tex] = [tex]\frac{1.8}{3}[/tex] ( cross- multiply )
3JK = 7.2 ( divide both sides by 3 )
JK = 2.4