Https://youtu.be/5C9LBF3b65s this should help you understand it
Answer:
Step-by-step explanation:
base=42 m
height=h=?
base angle θ=60°
tan 60=h/42
h=42tan 60=42√3≈72.75 m
height of taller building=135+42√3 m≈135+72.75≈207.75 m≈208 m
2x+6 = 20
take 6 from both sides
2x = 14
divide by 2 on both sides
x = 7