Question

I’m confused on this one

Answer 1

You can prove the triangles congruent by SAS, so by CPCTC, sides FB and FA are congruent.

4x + 12 = 2x + 48

2x = 36

x = 18

FB = 2x + 48

FB = 2(18) + 48

FB = 36 + 48

FB = 84