Answer:
1) 4
2) 12
3)AB
Explanation:
1) AC is 8, and since it bisects it is cut in 2
2) With the Pythagorean theorem, we know that side a² x side b² = side c²
so 4² x 9² = c² aka 16x9 = 144
square root bla bla, 12
3) as explained in 1) , it got cut into two, so AB = BC