Answer:
Step-by-step explanation:
1)
∠AOB + ∠BOC = ∠AOC
(x + 7) + (x + 7) = 7x - 1
7 + 7 + 1 = 7x - x - x
15 = 5x
x = 15/5
x = 3
2)
5x = 7x - 20
5x - 7x = -20
x = -20 / -2
x = 10
∠TAD = 180 - 5x
∠TAD = 180 - 5(10)
∠TAD = 130°
