Question 613364
You're on the right track


a^2+b^2 = c^2


x^2+x^2 = 16^2


x^2+x^2 = 256


2x^2 = 256


x^2 = 256/2


x^2 = 128


x = sqrt(128)


x = sqrt(64*2)


x = sqrt(64)*sqrt(2)


x = 8*sqrt(2)


x = 8*1.41421356


x = 11.313708


Round this to the nearest tenth to get x = 11.3