Respuesta :

[tex]b^2+35^2=40^2\\ b^2+1225=1600\\ b^2=375\\ b=\sqrt{375}\approx19.4[/tex]
a^2 + b^2 = c^2

35^2 + b^2 = 40^2

1225 + b^2 = 1600
-1225 -1225
b^2 = 375

b = 19.36

So your answer will be 19.4