Answer:
x = 13 and m<ABC = 35
Explanation:
Since perpendicular lines form right angles, (3x-4)+(2x+29) = 90. You can simplify this to 5x+25=90. Use the properties of equality by subtracting 25 from both sides to get 5x=65, and then divide by 5 to get x=13. Plug in 3x-4 where x = 13 because m<ABC=3x-4. 3(13)-4=35, so m<ABC=35.