Answer:
B
Step-by-step explanation:
Trapezoids have only one pair of parallel lines.
2a - 7 - 6a = 9
- 4a - 7 = 9
- 4a = 16
a = -4
x = 10
30/35 = (6x-6)/63
210x - 210 = 1890
210x = 2100
