Please help me now plz
I will mark you brainliest

Answer:
B.) x=5
Step-by-step explanation:
Use the Pythagorean theorem. Since it isosceles, both values of x are the same. Split 6 in half (because perpendicular bisector).Insert values:
[tex]a^2+b^2=c^2\\3^2+4^2=x^2\\9+16=x^2\\25=x^2\\5=x[/tex]
X is equal to 5.
Done.