Answer: 20
Explanation:
i tried the last answer and it worked
Answer:
angle ABC+ angle DBC = 90 ( given)
x + 3x +10=90
4x +10 =90
4x= 90-10
4x =80
x= 80÷4
x=20
u can add this degree (°) sign ok
5.3m questions
6.9m answers