How do i solve # don't just give me the tell me how u got !

XZ = " 5.831  units " .


XY = 3 units (obtained from counting on the graph provided).

YZ = 5 units (obtained from counting on graph provided). 


To find ZX (the hypotenuse);  use the Pythogorean Theorem:

   →  3²  +  5²  = c² ;  in which "c" = ZX ; 

   → c² = 3² + 5² = 9 + 25 = 34 ;

   → c²  = 34 ; 

To find "c" ; take the positive square root of each side of the equation; 
      to isolate "c" on one side of the equation; & to solve for "c" ; 

   → √(c²) = √34 ; 

   →  c = 5.8309518948453005 ; 

               →  round to:  "5.831 "