Answer:
 Length of the leg b is: 
17.2 units
Explanation:
We are given that:
The values a=8 which is a leg of a right triangle and value c=19 which is the hypotenuse.
We have to find the length of the other leg b to the nearest tenth.
 By phythagoras theorem
 a²+b²=c²
⇒  8²+b²=19²
⇒ b²=361-64
⇒ b²=297
⇒ b=17.23
Hence, length of the leg b is:
 17.2 units