Respuesta :

gmany

Use the Pythagorean theorem:



[tex]x^2+38^2=42^2\\\\x^2+1444=1764\ \ \ \ |-1444\\\\x^2=320\to x=\sqrt{320}[/tex]



Answer:


[tex]b.\ \sqrt{320}\ or\ appx\ 17.9[/tex]