Answer: 21
Step-by-step explanation:
Since line L is parallel to line RA, this means the pieces formed by line L cutting into the triangle are proportional.
That means we can set up the proportion below to solve for d
14/d = 24/36
14*36 = d*24
504 = 24d
24d = 504
d = 504/24
d = 21
Other equations are possible to set up, but you should get the same result regardless.