Answer:
20116
Step-by-step explanation:
18880 x .07 = 1316
18800 + 1316 =20116
Yes, lines CD & AB are perpendicular
AB slope: y = -12/8x + 7
CD slope: y = 6/9x - 6
Once the slopes are simplified:
AB: -3/2
CD: 2/3
Hope this helps!