Please help what is the answer?

Answer:
The value of x is 42°.
Step-by-step explanation:
Given AB and BC are perpendicular lines which means that AB is 90° to BC. So in order to find the value of x, you have to substract 24° and 24° from 90° :
[tex]24° + x + 24° = 90°[/tex]
[tex]x = 90° - 24° - 24°[/tex]
[tex]x = 42°[/tex]